sobriquet said:I've lost some data on a 2 tb WD mybook usb drive. When
I did a full scan, it found something like 3 mb in bad sectors.
However, when I reformatted the drive, somehow all bad sectors were
recovered. Apparently, there is some redundancy in diskspace, so it
can allocate some of that extra space to substitute for the bad
sectors on disk when it's just a small section of bad sectors.
Yes, all modern hard drives have spare sectors
that can be used as substitutes for bad sectors.
The disk is also able to pass the short drive test (in winDLG
under xp), that it used to fail, before I reformatted the drive.
Now I wonder if the fact that previously bad sectors have occurred and
I've lost data, is that increasing the likelyhood that this might happen again?
Yes, that many bad sectors does indicate a problem with
the drive or that the drive is running much too hot etc.
Is the drive less reliable in any way once a small
number of bad sectors have been identified
Yes, and 3MB is not a small number of bad sectors.
(even though the bad sectors are no longer visible after the drive has been
formatted again and other drivespace is substituted for the bad sectors)?
Yes, it either indicates that the drive is dying, or that its running stinking hot etc.
Below is the original log from chdsk when the bad sectors were found:
chkdsk isnt a very useful indication of the health of the drive.
You really need a proper SMART report on the drive.
That isnt necessarily that easy to get for free with an external drive.