Quantum lowlevel format?
15-May-95 22:39:23
Sb: #197125-Quantum lowlevel format?
Fm: Oliver Kastl 100447,3361
To: John Gager 71336,624
>> Actually, most of the time if I need to prep a drive, it's one of my
SyQuest-270 carts, and I normally never low level format those anyway. I just
partition it, write the RDB, and AmigaDOS format. <<
Yes, John! I don't lowlevel format drives just for fun either.. But sometimes a
low-level format is the only way to "repair" a dead disk. It once happened to
me that my Seagate Barracuda 2 gig drive suddendly died (well, actually I was a
bit guilty on that.. I popped the SCSI connector in/out while power was on). It
really was "dead as a doornail", and lowlevel format from HDToolBox didn't
work. Then I tried to REALLY lowlevel format the beast by sending a SCSI Format
Unit command. And – surprise! – it worked. It took very long, but the drive is
now working as before. It didn't loose capacity either.
Another reason to lowlevel format: Some SCSI drives do remap bad sectors "on
the fly", or you can instruct them to reassign sectors. If sectors are
reassigned and you do a lowlevel format now, some drives are clever enough to
mark these sectors as bad. This means: The "bad" sector is not remapped to a
spare sector, but the sector after the bad one will be the next block number.
This reduces the seek overhead for accessing a bunch of sectors sectors with a
"bad" one in the middle.
Oliver