This Linux storage feature feels like cheating once you understand it

Storage is one of those parts of Linux that most people only think about when something breaks. You pick a file system during install, trust it with your files, and then forget it exists. It sits under everything: your OS, your home folder, your logs, your downloads, your work, and all the small mistakes you make while changing things. For years, that mostly means one thing: when a file changes, the old data is overwritten by the new data, and you move on.

Copy-on-write (CoW) changes that bargain in a way that almost feels like cheating. Instead of rushing to overwrite old blocks, a CoW file system writes the changed data somewhere else and then updates its map. That simple shift is what makes snapshots, cheap clones, rollbacks, and smarter backups possible.

CoW changes the rule you thought was fixed

New writes leave old blocks alone

On a plain file system, changing a file often means changing the old blocks in place. On a CoW file system, the old blocks are left alone, and the changed data is written to new blocks. Only after that does the file system update its pointers.

This means the file system can keep an old view of the data without making a full second copy at the start. That one idea sits behind most of the features that make CoW feel unfair the first time it saves you. A snapshot can hold the old state. A cloned file can share blocks with the first file. A backup stream can send only what changed after an earlier snapshot.

Changed data still takes space. If you keep months of snapshots while rewriting huge files every day, your disk will still fill up and then look at you like you deserve it. The real deal is not that storage becomes free but how unchanged data does not need to be copied again just so you can keep another view of it.

The easiest way to feel CoW working is to think about a large file, such as a VM disk image. If you copy it the normal way, you get another full copy. If you copy it with reflinks on Btrfs, the second file starts out by sharing the same data blocks as the first. Both files look real, can be opened and changed. Yet the second one does not need another full pile of space at once.

Example of How CoW works vs normal copy operation

When one copy changes, only the changed parts need new blocks. The unchanged parts remain shared. This is the reason snapshots are so useful. A snapshot of a subvolume can be made almost at once, because it begins as another view of the same blocks. As the live system changes, the snapshot keeps holding the old blocks. That makes snapshots perfect before system upgrades, risky config edits, package cleanups, and late-night experiments that begin with “this should only take a minute.”

Btrfs Is the Linux friendly way in

It is close to the kernel and easy to reach

On Linux, Btrfs is the easiest way to start using CoW storage. It lives in the kernel tree, its user-space tools are widely packaged, and many distributions know how to install directly onto it. Debian can use Btrfs during installation, and on a spare disk you can start testing it with only a few commands.

screenshot of btrfs documentation homepage

Btrfs gives you subvolumes, snapshots, checksums, reflinks, and send/receive. This makes it useful on laptops, desktops, small home servers, backup drives, and test boxes. You can keep your root file system on one subvolume, your home directory on another, and your snapshots somewhere easy to manage.

OpenZFS is the other big name in this space, and there are cases where it is the better choice. If you are building a storage server with mirrors, RAIDZ, datasets, quotas, scrubs, snapshots, and replication, OpenZFS often feels more mature. Its tools are clear, its pool model is strong, and its history in storage-heavy setups is hard to wave away.

Backing up isn’t enough: A modern guide to ZFS on Linux

It’s awesome—but it, sadly, has some downfalls.

The catch is Linux support, OpenZFS on Linux has improved a lot, and recent releases keep up with newer kernels better than it once did. Still, it is not as close to Linux as Btrfs. Btrfs is part of the kernel whereas OpenZFS is not, mostly because of licensing, so on Debian it comes through contrib and DKMS packages that build a kernel module for your system. This works well for many users, but it remains another moving part.

Set up a safe btrfs setup on Debian

Use a loopback disk before touching real data

The best way to learn about CoW is not to reinstall your machine. Use a spare disk, a USB SSD, or a loopback file. A loopback file is slower than a real disk, but it is good enough for learning snapshots, reflinks, and subvolumes without risking anything useful.

Install the tools first:

sudo apt update -y
sudo apt install btrfs-progs -y

Create a test image:

truncate -s 5G ~/btrfs-demo.img
sudo losetup --find --show ~/btrfs-demo.img

The last command prints a loop device, such as /dev/loop11. Using the device, the system shows:

sudo mkfs.btrfs -L cowdemo /dev/loop11
sudo mkdir -p /mnt/cowdemo

Create a subvolume and clone a File

This is where CoW starts to look fake

Create a subvolume for your test data:

sudo btrfs subvolume create /mnt/cowdemo/@data
sudo mkdir -p /mnt/cowdemo/@data/projects

A subvolume looks like a folder, but Btrfs treats it as its own file tree. That is why it can be snapshotted on its own.

Now create a large test file:

cd /mnt/cowdemo/@data/projects
sudo dd if=/dev/zero of=bigfile.img bs=1M count=1024 status=progress

Make a reflink copy:

sudo cp --reflink=always bigfile.img bigfile-copy.img
ls -lh
sudo btrfs filesystem du -s .

ls shows two large files, but Btrfs knows they share blocks. You appear to have copied a 1GB file, yet the file system has not spent another full gigabyte right away.

Now change part of the copy:

sudo dd if=/dev/urandom of=bigfile-copy.img bs=1M count=50 conv=notrunc,fsync status=progress
sync
sudo btrfs filesystem du -s .

Only around 50 MiB became new unique data, while most of the 1 GiB is still shared. The shell says there are two 1 GiB files but Btrfs says only 1 GiB is actually shared on disk, and that is the part that really does feel like cheating.

3 copies, 2 formats, 1 big problem: Why modern backups fail

The ‘3-2-1’ backup rule is finally outdated – here’s what to do instead

CoW changes how you think about storage

CoW is easy to undersell if you describe it as one more file system feature, because the real change is in the habits it makes possible. Instead of copying a whole directory before testing a risky change, you can take a snapshot, use old states, cheap clones, and rollback paths, and keep working. Once that clicks, CoW feels like one of those Linux features you wish you had learned years ago.

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Stephan Dorsey

Stephan is the sports journalist for the Maple Grove Report.

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Recent Reviews

Treatment for Factitious Disorders

Key Takeaways: Navigating Recovery

Internal Motivation: Unlike malingering, factitious disorder is driven by an emotional need to be cared for, not financial gain.
Immersion is Key: Residential care breaks the cycle of “doctor shopping” and provides the safety needed to drop the “patient” persona.
Therapy over Confrontation: Evidence shows that gentle, non-judgmental therapy (like DBT) works better than confronting the deception directly.
Treat the Whole Person: Successful recovery requires addressing co-occurring issues like depression, trauma, and personality disorders simultaneously.

Understanding Factitious Disorder

What Sets This Condition Apart

Finding effective factitious disorder treatment begins with understanding the unique nature of the condition. What truly makes factitious disorder unique is the underlying drive: the person is not seeking financial gain, legal advantage, or other obvious external rewards. Instead, the need to be seen as ill or to receive medical attention is deeply internal, often rooted in complex emotional pain. This sharply distinguishes it from malingering, where the intent is to manipulate for tangible benefits⁴.

We see individuals go to extraordinary lengths to maintain the ‘patient’ identity. Common behaviors include:

Undergoing invasive and unnecessary medical tests.
Fabricating symptoms or altering medical records.
Self-harming to produce physical evidence of illness.
Repeatedly checking into different hospitals using false names.

To illustrate, someone might tamper with lab samples or injure themselves just before a doctor’s appointment, all in pursuit of care and sympathy.

The emotional toll is immense—not just for the person struggling, but for loved ones and their care teams. Data shows that women make up about two-thirds of diagnosed cases, and over 40% of people with this disorder also have another serious mental health issue, such as borderline personality disorder^{1, 4}. These overlapping challenges can make accurate diagnosis and tailored factitious disorder treatment especially complex.

Recognizing these subtle but important differences is a crucial first step toward finding approaches that offer real relief and healing. Next, we’ll explore why many standard treatments fall short for this condition.

Why Traditional Treatment Often Fails

Traditional approaches to mental health care often fall short when it comes to factitious disorder, and the reasons are rooted in the very nature of this condition. A striking 60% of individuals with factitious disorder either refuse psychiatric help or abandon treatment midstream, which means most never benefit from consistent care⁴.

This isn’t just about denial—there is often a deep mistrust of mental health providers and a profound attachment to the patient role. In our experience, standard outpatient therapy and brief hospital stays rarely provide the structure or depth needed due to several factors:

Treatment Setting	Common Limitation
Short-term Interventions	Focus on symptom management but miss the complex web of trauma or self-identity issues.
Fragmented Care	Allows the cycle to repeat as individuals bounce from provider to provider without building trust.
Medical Settings	Teams are often frustrated by deception, leading to confrontation rather than therapeutic support.

This is why standard factitious disorder treatment—especially when delivered in fragmented, hurried settings—often doesn’t create lasting change¹. Next, let’s look at which evidence-based approaches actually work when the usual options don’t.

Core Factitious Disorder Treatment Approaches That Work

Psychotherapy as the Foundation

We always begin factitious disorder treatment with a strong focus on psychotherapy. This is the anchor for any hope of real, lasting change. The challenge is unique: many people struggling with this disorder have learned to distrust providers and often avoid or abruptly leave care. So, building trust is our first therapeutic goal.

One of the most effective therapy styles for this population is Dialectical Behavior Therapy (DBT). DBT’s focus on emotional regulation and distress tolerance fits well with the emotional storms that drive factitious behaviors. To illustrate, we’ve seen clients learn to ride out urges to seek medical attention by practicing mindfulness or using self-soothing skills learned in session.

Another important tool is Cognitive Behavioral Therapy (CBT), which can help untangle the thought patterns fueling the continual drive for medical care. For example, someone may come to recognize that their anxiety spikes with feelings of abandonment, and seeking treatment becomes a way to manage that pain—even when it leads to harm.

The research is clear: outpatient therapy alone has a high dropout rate, but intensive, relationship-based psychotherapy makes it more likely that a person will stay engaged and move toward recovery¹. This approach is ideal for those who feel misunderstood by past providers or have a history of cycling through brief interventions.

We also integrate trauma-informed modalities like EMDR and somatic experiencing, when appropriate, addressing the deep roots of distress. Our experience shows that recovery is possible when therapy is compassionate, flexible, and tailored to the individual. Next, we’ll share how addressing co-occurring conditions can further support progress and prevent setbacks.

Addressing Co-Occurring Conditions

A crucial piece of effective factitious disorder treatment is recognizing and treating co-occurring mental health conditions. In our clinical experience, it’s rare to meet someone with factitious disorder who doesn’t also struggle with additional diagnoses like depression, anxiety disorders, or personality disorders—especially borderline personality disorder.

In fact, research shows that more than 40% of people with factitious disorder also meet criteria for a personality disorder, and up to 42% experience significant depressive symptoms^{4, 8}. Ignoring these overlapping challenges leads to stalled progress and frequent setbacks.

That’s why we always conduct a thorough neuropsychological assessment at admission. This lets us tailor every aspect of care—not just for factitious behaviors, but for the full tapestry of symptoms each person brings. For instance:

If a client is living with major depression, we integrate evidence-based antidepressant therapy and targeted mood-support interventions.
If trauma is a key driver, trauma-focused modalities like EMDR become part of the plan.

This approach works best when our team collaborates closely across disciplines—psychiatrists, therapists, and wellness practitioners all working together, reviewing progress in weekly team meetings, and adjusting care in real time. To give a real-world example, we’ve seen clients make their first real breakthroughs only after their anxiety or trauma symptoms are stabilized and addressed alongside factitious behaviors.

Addressing the whole person—body, mind, and relationships—can transform the trajectory of recovery. Next, we’ll show how residential treatment can break the cycle and offer the immersive support needed for lasting change.

Why Residential Factitious Disorder Treatment Changes Outcomes

Breaking the Cycle Through Immersion

We’ve seen firsthand how the cycle of factitious disorder can feel unbreakable—especially when someone is caught in a loop of medical visits, mistrust, and short-lived interventions. The immersive environment of residential care is often the missing link for people who haven’t found relief elsewhere. Here, every detail is designed to support recovery, from the warm, home-like setting to the constant presence of a highly trained team.

In residential factitious disorder treatment, clients step away from the triggers and routines that reinforce their illness behaviors. The structure is gentle but consistent. Daily schedules include:

Individual therapy sessions (minimum five per week).
Group processing sessions.
Holistic activities like yoga and meditation.
Nutrition counseling with a Registered Dietitian.

For example, we’ve seen clients who previously spent most days managing elaborate medical stories gradually relax into a rhythm of real connection and honest self-reflection—instead of crisis and concealment. This approach works best when someone has cycled through multiple outpatient or hospital-based attempts and needs a safe place where their behaviors can be understood without judgment.

In our setting, the staff-to-client ratio is intentionally low—never more than six clients per home—so every person receives genuinely individualized care and close monitoring. This kind of immersive support helps clients tolerate the anxiety that comes with giving up the patient role, which is often the most daunting part of recovery. Research backs up what we observe daily: residential treatment dramatically increases engagement and reduces self-harm behaviors by providing around-the-clock therapeutic consistency and a supportive peer community^{1, 4}.

Up next, we’ll look at how thorough assessment and precise diagnosis in this environment set the stage for lasting healing.

Comprehensive Assessment and Diagnosis

Accurate assessment is the bedrock of effective factitious disorder treatment. Many clients arrive after years of misdiagnosis, unnecessary medical procedures, or fragmented care. In our residential setting, we start with a full neuropsychological evaluation that looks far beyond surface-level symptoms.

This process includes in-depth interviews, cognitive testing, and structured observation by our multidisciplinary team—psychiatrists, psychologists, and medical staff all collaborating from day one. To illustrate, a client might arrive with a thicket of medical records and conflicting diagnoses. We sift through every detail, looking for patterns in symptom presentation, medical history, and emotional triggers. This approach is ideal when previous providers have struggled to distinguish factitious behaviors from complex medical or psychiatric conditions.

Research shows that up to 1% of all hospitalized patients exhibit factitious symptoms, but many go undetected because the signs can be subtle or masked by co-occurring disorders⁵. Our thorough assessment process means we don’t just label behaviors—we dig into underlying emotional pain, trauma history, and the presence of conditions like depression or personality disorders, which affect more than 40% of those with factitious disorder⁴.

This level of diagnostic precision is only possible in a setting with continuous observation and expert collaboration. By investing the time and resources upfront, we’re able to create a treatment plan that addresses every layer of suffering—not just the visible symptoms. With a clear diagnosis and a nuanced understanding of each client’s needs, the path toward real healing opens up. Next, we’ll discuss how skill-building and relapse prevention empower clients for life beyond residential care.

Building Skills for Lasting Recovery

I’ve watched too many talented, insightful individuals cycle through treatment programs that helped them understand their conditions but never taught them how to actually manage them. They could articulate the neuroscience of their anxiety or trace the roots of their depression, yet when symptoms flared in real life, they had no practical tools to reach for. That gap—between insight and capability—is precisely why I’ve built skill-building into the foundation of everything we do here.

Skills, not just understanding, create lasting recovery. Without concrete techniques you can deploy in moments of crisis, all the therapeutic insight in the world remains theoretical. I’ve designed our program to close that gap through intensive, personalized skill development that transforms how you respond to life’s challenges.

Take someone struggling with severe anxiety. Understanding the neurological basis of panic attacks provides valuable context, but it doesn’t stop the racing heart or intrusive thoughts in the moment. That’s where evidence-based therapeutic modalities become essential tools rather than abstract concepts.

Through intensive individual therapy—which I’ve structured at five sessions per week to ensure adequate practice and refinement—you’ll work one-on-one with your therapist to develop personalized coping strategies. This frequency isn’t arbitrary; I’ve found that meaningful skill acquisition requires consistent repetition and immediate course-correction, which simply isn’t possible with once-weekly sessions.

I integrate multiple therapeutic approaches because different challenges require different tools:

Dialectical Behavior Therapy (DBT): Teaches distress tolerance skills, mindfulness exercises you can deploy anywhere, and interpersonal effectiveness strategies.
Cognitive Behavioral Therapy (CBT): Helps you identify and restructure the thought patterns that fuel symptoms, actively rewiring your brain’s default responses.
EMDR and Somatic Experiencing: Offer pathways to process painful memories without becoming overwhelmed, helping your nervous system release stored trauma.

The intimate six-client setting I’ve created accelerates this learning process dramatically. You’re not lost in a crowd of thirty residents. I ensure your clinical team knows your specific challenges intimately and can provide immediate feedback as you practice new skills in real-world scenarios. Weekly multidisciplinary team meetings keep everyone—your psychiatrist, therapist, dietitian, personal trainer—coordinated around your skill development.

But here’s what I’ve learned over years of treating complex cases: clinical skills alone aren’t enough. The most sophisticated CBT techniques can fail if you’re sleep-deprived, nutritionally depleted, or disconnected from your body. That’s why I’ve expanded our definition of “skills” beyond the therapy room to include the holistic practices that support your entire system.

Our wellness offerings—yoga, meditation, physical fitness—aren’t pleasant additions to your day. They’re practical tools I expect you to carry forward. I’ve brought an on-site Registered Dietitian Nutritionist onto our team because I’ve seen how profoundly nutrition impacts mental health. You’ll develop meal-planning skills and learn how blood-sugar regulation affects mood—knowledge that continues serving you long after discharge.

Perhaps most importantly, I require every client to create a comprehensive relapse-prevention plan before leaving. This isn’t a generic template. It’s a personalized roadmap identifying your early warning signs, listing specific skills for each scenario, and connecting you with ongoing support resources. The skills you build here become second nature through consistent practice in a supportive environment. By the time you transition home, they’re not theoretical concepts. They’re tested tools you trust because you’ve seen them work.

Frequently Asked Questions

How do I know if a loved one has factitious disorder versus another mental health condition?

Factitious disorder can look very similar to other mental health conditions, but there are clues that help set it apart. The hallmark sign is a persistent pattern of faking or exaggerating symptoms without any obvious external motive—like financial gain or avoiding responsibility. Loved ones might notice repeated hospital visits, constantly shifting stories about illness, or medical evidence that doesn’t add up. To illustrate, someone may seem unusually knowledgeable about medical details, or show relief when tests come back negative even as they insist something is wrong. Diagnosing factitious disorder is complex, and often requires a full psychiatric and medical assessment by experienced professionals. Over 40% of people with this disorder also have another psychiatric condition, which adds to the confusion⁴. If you’re unsure, seeking an evaluation from a team specializing in factitious disorder treatment is the safest first step.

What should I do if my family member refuses to acknowledge they need psychiatric help?

When a loved one resists psychiatric help, it’s heartbreaking—but you’re not alone. Over 60% of people with factitious disorder either refuse or drop out of treatment, often because acknowledging the problem feels deeply threatening or shameful⁴. Instead of confronting or pressuring them, focus on maintaining a caring, nonjudgmental connection. Share your concern using “I” statements and let them know you’re there no matter what. Sometimes, inviting them to join you for a family therapy session (even if they decline individual help) can be less intimidating. Above all, don’t try to force insight—healing starts with trust and safety, and small openings often come over time through consistent support and gentle encouragement¹.

Can someone with factitious disorder recover if they’ve been struggling for years?

Yes, recovery is absolutely possible—even for those who’ve struggled with factitious disorder for many years. While the journey can be long and challenging, we’ve seen clients make remarkable progress with the right factitious disorder treatment. Intensive, relationship-based therapies like DBT and trauma-informed care provide new ways to cope, and the immersive support of residential settings helps break old cycles¹. To illustrate, some of our clients arrive after decades of hospital visits, yet gradually build trust, learn healthier skills, and reclaim meaningful parts of life. The key is a compassionate team, individualized treatment, and the willingness to try again—no matter how many setbacks have come before.

How does residential treatment differ from outpatient therapy for factitious disorder?

Residential factitious disorder treatment offers an immersive, structured environment that is fundamentally different from outpatient therapy. In residential care, clients receive daily, intensive individual and group therapy, 24/7 support, and comprehensive neuropsychological assessment—all in a safe, home-like setting with a small client-to-staff ratio. This allows for close monitoring, rapid adjustment of treatment plans, and deep trust-building, which is often a turning point for those who have struggled to stay engaged in outpatient care. Outpatient therapy, by contrast, typically involves weekly sessions and limited contact, which may not provide enough stability or accountability for lasting progress. Research shows that residential treatment dramatically increases engagement and reduces self-harm behaviors because of its consistent, supportive structure¹.

Will my loved one be confronted about their behaviors during treatment?

Direct confrontation is not part of our approach to factitious disorder treatment. In fact, research and clinical experience show that confronting a client about deceptive behaviors usually leads to shame, defensiveness, and often causes the person to leave treatment prematurely¹. Instead, our clinicians use gentle curiosity and nonjudgmental support to build trust over time. For example, a therapist may invite a client to explore what emotional needs their symptoms help meet, rather than focusing on “catching” them in a lie. This strategy creates a safe space for honesty and self-reflection, making real progress much more likely.

What role does family therapy play in treating factitious disorder?

Family therapy is a vital part of factitious disorder treatment because it helps repair trust, open communication, and reduce the isolation that often fuels symptoms. When families are included, we can address misunderstandings, set healthy boundaries, and educate loved ones about the nature of the disorder. For instance, sessions might focus on shifting the family dynamic from “detective work” to compassionate support, giving everyone language to talk about needs and feelings without blame. Research consistently shows that involving families leads to better engagement and more lasting recovery for clients¹. By working together, families and clients can build a stronger, more supportive path forward.

How do you address the underlying trauma that often drives factitious behaviors?

We address the deep-rooted trauma underlying factitious behaviors through trauma-informed, evidence-based therapies as a core part of factitious disorder treatment. Our clinical team uses approaches like EMDR and dialectical behavior therapy (DBT) to help clients process past pain and develop new ways of coping. To illustrate, someone who has survived childhood neglect may, over time, learn in therapy to express their needs directly rather than through illness behaviors. We also integrate somatic practices, mindfulness, and body-based healing to reconnect clients with their physical and emotional selves. Research consistently shows these integrated approaches are essential for lasting recovery from factitious disorder¹.

Your Path Forward Starts Here

When clients complete our program, I see something remarkable: they don’t just leave with symptom reduction—they leave with a blueprint. They understand their warning signs, they know which skills work for their specific triggers, and they’ve practiced these tools enough times that they become second nature rather than abstract concepts.

That transformation from knowledge to capability is what we’ve spent years refining at Bridges. It’s why we limit each residence to six clients—because building these personalized skill sets requires the kind of attention that larger programs simply cannot provide. It’s why our doctoral-level clinicians coordinate across disciplines rather than working in silos. And it’s why we don’t hand you a generic relapse prevention plan on discharge day; we build it with you throughout treatment, testing and adjusting until it actually fits your life.

If you’re navigating depression, anxiety, trauma, or the complicated intersection of multiple conditions, this approach makes a tangible difference. Not because we’ve discovered some revolutionary technique, but because we’ve created the conditions where evidence-based treatment can actually work the way it’s supposed to.

I’d welcome a conversation about whether this model might work for you. Our admissions team knows our clinical approach intimately—they can walk you through what your days would look like, how we’d address your specific challenges, and what realistic outcomes might be given your situation.

You deserve care that matches the complexity of what you’re experiencing. You deserve a team that will stay with you until these skills become yours.

Let’s talk. Your path forward starts with understanding your options.