Can corrupted files be recovered?
Often, yes. Corruption means the data still exists but part of it is damaged, which is different from deletion, where the data is no longer there. How much comes back depends on what was damaged: repair tools can fix some file system damage but can also make things worse, and carving tools can pull readable parts out of badly damaged volumes. A recovered file that will not open is a real outcome.
Often, yes, though rarely all of it. Corruption and deletion are different problems. A deleted file is no longer present on the drive. A corrupted file is still there, but part of it has been damaged: it may refuse to open, open only partway, or show stray characters where content should be. Recovery tools treat the two as separate jobs, and the distinction matters, because it decides which approach has a chance of working.[1]
How files get corrupted
Corruption usually starts with an interrupted write. SanDisk's support documentation lists corrupted file systems, loss of power while a drive is in use, unsafe ejection and bad sectors among the causes of the Windows 'you need to format the disk in drive' prompt. A laptop dying mid-save, a cable pulled out during a copy, or a drive developing faulty areas can all leave a file, or the file system that describes it, half-finished.[2]
What repair tools can and cannot do
Repair tools such as Microsoft's chkdsk work on the file system rather than the files inside it. Microsoft documents that chkdsk checks a volume's file system and its metadata for logical and physical errors, and fixes them when run with the /f, /r, /x or /b parameters, with /r locating bad sectors and recovering readable information. Repairing that structure can make a drive readable again, but it is not the same as mending a damaged file's contents.[3]
Never run a repair tool against the only copy. Microsoft warns that repairs on FAT file systems usually change the disk's file allocation table and sometimes cause a loss of data, so a repair can succeed and still cost you file contents. If you can, copy the drive, or at least the files that matter most, somewhere else first, then repair the copy. If the drive itself is failing or the error message keeps returning, stop and look at the guides below before letting anything write to it.[3]
Reading what survives
Where the file system is too badly damaged to repair, carving tools take a different route. CGSecurity states that PhotoRec ignores the file system, so it works even when the file system is severely damaged, reading the raw data blocks and matching them against a built-in list of known file types. That can pull intact files out of a volume Windows cannot read at all, with the trade-off that everything the file system recorded about those files is bypassed too.[4]
Recovered does not always mean usable. CGSecurity's documentation notes that a carved file's meta-information, including its file name and date and time, is lost, so files come back numbered rather than named. Some will open perfectly; others will be fragments that stop partway. A recovered file that opens half-filled or not at all is a normal outcome when the underlying data is damaged, not a sign that you did something wrong.[4]
Where to go next
External drive detected but not accessible
How data recovery software works
Sources
Facts on this page are cited to the publishers’ own documentation.
- [1] CGSecurity — TestDisk. captured 2026-09-12.
- [2] SanDisk — Steps to resolve the 'you need to format the disk in drive' error message. captured 2026-09-12.
- [3] Microsoft — chkdsk (Windows command reference). captured 2026-09-12.
- [4] CGSecurity — PhotoRec. captured 2026-09-12.