Troubleshooting ATA Drives..
bshannon at tiac.net
Thu Mar 10 20:50:25 CST 2005
ZIP drives, and Compaq ATA drives will actually modify the data in some
sectors, there is indeed firmware control over the data written to disk.
Most often this is only for the boot block, but Compaq drives often have a
'fixed' partition with their diagnostics and remote admin crud.
These ATA drives are useless on other machines.
----- Original Message -----
From: "lee davison" <leeedavison at yahoo.co.uk>
To: <cctalk at classiccmp.org>
Sent: Thursday, March 10, 2005 10:30 AM
Subject: Troubleshooting ATA Drives..
>> It would be nice to know for historical purposes exactly which
>> vendors and when they started putting the firmware on the platter.
> I don't think it goes quite that far, most drives only store the
> geometry and block maps on tracks that are normally inaccessible to
> the user. All the firmware is usually in the memory on the controller.
> Seagate and Westarn Digital have had common electronics over different
> capacities from about the 1GB drive size. On Seagates the mechanism
> was interchangeable between ATA and SCSI controllers, something I used
> to exploit to transfer large ammounts of data between my Amiga and PC.
>> I'll also add my guesses as to why swapping platters is impossible.
>> When they build the drive, they clamp the platter on the hub, then
>> write it with servo information to let it find its tracks. Swapping
>> platters doesn't work because the two platters will never, ever sit
>> on the hub exactly the same way.
> It doesn't matter, all that's needed is a LL format and all the data
> tracks are re-written. Some manufacturers provide tools to do this as
> just doing a format from the OS won't do a LL format.
>> The expensive places must have some way to pull a platter with the
>> valuable info to be rescued, then re-align to find the true center,
>> then attempt to read the data.
> No need, they use things like dynamic tracking, even on data only
> platters, if needed but disassembling drives is always avoided if
> Send instant messages to your online friends http://uk.messenger.yahoo.com
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