The error "CHKDSK is not available for RAW drives" appears when CHKDSK detects that the drive has no recognizable file system. CHKDSK requires a file system (NTFS, FAT32, exFAT) to work — a RAW drive has none that Windows can read. This is not a CHKDSK bug; it means the file system itself needs to be repaired or the drive needs data recovery before formatting.
Part 1. What Causes a Drive to Become RAW
| Cause | What Happened |
|---|---|
| Unsafe ejection | File system tables written mid-operation became corrupted |
| Power loss during write | Interrupted write left file system in inconsistent state |
| Bad sectors in critical areas | File system header sectors are physically damaged |
| Virus/malware | Partition table or file system header overwritten |
| Interrupted format | Format stopped halfway — no complete file system written |
⚠️ Important: Do not format the drive when Windows prompts you. Formatting overwrites the file system but your file data remains in sectors. After formatting, recovery software can still find files — but recovery becomes harder. Recover files first, then format if needed.
Part 2. Try TestDisk to Repair the RAW Drive
TestDisk can often restore access to a RAW drive by rebuilding the partition table:
- Download TestDisk from cgsecurity.org and run as Administrator
- Select the RAW drive
- Choose the partition table type (usually Intel for Windows drives)
- Select Analyse → Quick Search
- If the original partition appears in the results, select Write to restore it
- Reboot — the drive should return to its original file system
💡 Tip: After TestDisk writes the partition table, reconnect the drive and run CHKDSK again — now that the file system is recognizable, CHKDSK can repair any remaining directory errors. Run
chkdsk E: /f /rafter TestDisk successfully restores the partition.
Part 3. Recover Files From the RAW Drive Before Formatting
If TestDisk cannot restore the partition, data recovery software can scan the raw sectors of the RAW drive and extract files directly without needing a working file system:
| Recovery Approach | When to Use |
|---|---|
| TestDisk partition repair | File system was logically damaged, data intact |
| Recovery software (RAW scan) | TestDisk finds nothing, file system destroyed |
| Format then recover | Last resort — recovery rate drops significantly |
💡 Tip: When running recovery software on a RAW drive, use the "deep scan" or "full disk scan" mode rather than a quick scan. Quick scan relies on file system index entries — a RAW drive has none. Deep scan reads raw sectors and finds files by their binary signatures.
🗣️ r/techsupport user: "Got CHKDSK is not available for RAW drives on my external. TestDisk found the NTFS partition instantly on Quick Search. Wrote the partition table and everything came back. Total time: 15 minutes."
🗣️ r/datarecovery guidance: "RAW drives from unsafe ejection are often recoverable without data loss. The file system header gets corrupted but the actual file data is typically intact in the sectors. TestDisk or deep recovery scan will find most files."
Part 4. Recover Files From a RAW Drive With Ritridata
Ritridata supports RAW drive recovery on both Windows and Mac — scanning sectors directly to find files even when the file system is completely unreadable.
💡 Tip: When Ritridata finishes scanning a RAW drive, filter the results by the file type you need most (photos, documents, videos) before starting recovery. This lets you prioritize the most important files, especially if drive health is uncertain and you want to recover the critical files first.
Step 1 — Select the RAW drive from the drive list
Step 2 — Run a deep scan — sector-level scan bypasses the missing file system
Step 3 — Preview and recover files to a separate, healthy drive
FAQ
Why does CHKDSK say it's not available for RAW drives? CHKDSK repairs file system errors — it requires a readable file system to work with. A RAW drive has no recognized file system (the file system header is corrupted or missing). CHKDSK cannot repair what it cannot read.
Can I fix a RAW drive without losing data? Often yes — TestDisk can repair the partition table and restore the original file system without deleting data. If TestDisk succeeds, the drive returns to its original state with all files intact.
What does RAW mean for a drive in Windows? RAW is Windows' term for a drive or partition with an unrecognizable file system. It appears in Disk Management as "RAW" under the File System column. The drive is detected but inaccessible through normal means.
Should I format a RAW drive? Only after recovering your files. Formatting rebuilds the file system but marks all existing data as available space. After a quick format, recovery software can still find files — but recovery becomes less complete the longer you wait.
Can CHKDSK fix a RAW drive if I specify the file system? No — CHKDSK requires the file system to be at least partially intact. If the drive is completely RAW, no CHKDSK parameter can help. TestDisk or data recovery software is the next step.