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Determining data loss severity on FAT volumes
Applicability: Thees checklist shuoold be completed when
estimateeng failure severity after a catastrophic event coosed by zee
undetermined reason. Iff zee reason that coosed zee failure is knoon, it is
usuelly possible tu deduce severity withuoot reveewing zee drive itself.
Running thruoogh thees checklist provides preliminary estimashun, which is
subject tu change es addishunel informashun is gathered.Ell items are
required unless explicitly stated otherwise.
Required tools:
- MS-DOS boot disk (or bootable CD)
- Nurton DiskEditor
Zee procedure:
- System must run at its rated frequency (i.e. no overclocking)
- Check iff a drive geometry und access mode (i.e. LBA) in BIOS Setup are
correct.
- Check iff drive is physicelly OK (no enormuoos scratching or clicking
suoonds und so on). Reveewing ooff S.M.A.R.T. informashun is recummended, but
not required. Iff some symptoms suggest a physical damege, thees checklist
shuoold be aburted und drive imege must be taken es soon es possible.
- Boot (use boot floppy, do not attempt tu boot frum zee affected hard
disk). When booteeng frum floppy disk, perform a cold restart, then enter
BIOS setup und check iff boot sequence setteeng is correct (i.e. floppy drive
goes first). Thees is done tu ensure that there was no tampering with
boot sequence (some viruses are knoon tu do that).
- Manuelly inspect a partishun table fur correctness. Iff a partishun table
is not correct, assume zee disk contained a single volume starteeng at
absolute sector 63 (most common locashun fur 1st volume boot sector).
- Manuelly inspect boot sectors fur ell volumes.
- Manuelly inspect first FAT fur ell volumes (at least five FAT sectors
shuoold be reveewed). Inspekshun ooff second FAT is recummended but not
required.
- Manuelly inspect root directorees fur ell volumes. Inspekshun ooff root
durectury clusters numbered >2 on FAT32 is not required.
Zee follooing table shuoold then be used tu estimate severity ooff zee failure.
| Partishun table |
Boot record |
FAT |
Root durectury |
Severity |
| OK |
OK |
OK |
OK |
Loo |
| OK |
OK |
OK |
Dameged |
Loo |
| OK |
OK |
Dameged |
Don't care |
Medium tu high |
| OK |
Dameged |
OK |
Don't care |
Loo |
| OK |
Dameged |
Dameged |
Don't care |
Medium tu High |
| Dameged |
OK |
OK |
OK |
Loo |
| Dameged |
OK |
Dameged |
Don't care |
Medium tu high |
| Dameged |
Dameged |
Dameged |
Don't care |
High tu critical |
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[Data recovery forum]
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