Do not use CHKDSK or file-system repair if the drive is damaged
A drive in a Warsaw office becomes RAW, Windows suggests repair, and someone runs chkdsk /f because it sounds official. On a healthy disk with a backup, that may be routine. On a failing drive, CHKDSK can change the only map we have left.
Many users reach for CHKDSK because the problem appears as a file-system issue. The danger is that the file system may only be the symptom. The root cause can be bad sectors, weak heads, firmware hangs or unstable flash memory.
When CHKDSK is risky
Do not run CHKDSK on the original drive if it clicks, freezes the computer, drops from the system, reports I/O errors, shows bad sectors, suddenly becomes RAW or mounts only sometimes.
CHKDSK is not a read-only viewer. It can move records, truncate damaged entries, create FOUND.000 fragments or delete directory references while trying to make the volume mountable again. That can reduce what later recovery can reconstruct.
Stable media versus unstable media
On stable media, the responsible order is backup first, then repair on a copy or on a device you can afford to lose. On unstable media, the order changes: stop writes, image the device sector by sector where possible, and analyse the copy.
If the drive contains the only copy of important files, do not test repair tools directly on the original.
RAW, formatting and automatic repairs
A RAW volume, format prompt or unknown/uninitialised disk message does not mean the files are gone. It means the system cannot safely interpret the current structures.
Before approving repair or format prompts, read what to do when a drive shows as RAW and why initialising an unknown disk can be risky.
What to do instead of running CHKDSK again
- Stop automatic repairs and avoid repeated mounting attempts.
- Write down the messages, capacity shown by the system and physical symptoms.
- Check whether a current, restorable backup exists.
- Do not work directly on the original if the data is important.
- If CHKDSK, TestDisk or recovery software has already been run, mention it in the case description.
When to send the case for diagnosis
Choose diagnosis instead of another repair attempt when the data is valuable, the drive behaves inconsistently, there is no verified backup, or an automatic repair has already changed the state of the disk.
If you need to estimate the next step before sending the device, see how data recovery cost is assessed and describe the symptoms as precisely as possible.
Safety rule: if the drive is unstable, the first goal is to preserve readable sectors, not to make Windows display the volume again at any cost.