On Feb 25, 2004, at 9:59 AM, jimwg wrote:
I understand that there's supposedly a 4gig drive limit to using SCSI to avoid data corruption on the host computer,
yes there is.
but even though my PB
190 has a 30gig Travelstar aboard, I partitioned it into eight partitions
of 3.4 gigs each, and my 6320's 10gig Western Digital HD is partitioned
into 3.2 gig partitions, so that should well get me under this 4gig SCSI
limit, right?
Wrong! The 4GB limit is due to an integer 'rollover' in physical addressing in the rom. All partitioning does is map partitions to physical addresses 'partition 1 is sector 1-32000 of device A, partition 2 is sector 32001-64000', etc, it does not re-set the count. The moment you write past 4GB you start over writing at 0 again, which pretty well hoses the drive.
If you're *very* careful not to write beyond 4GB, it will work. I was able to copy everything to a new 6gb drive in my 5300 via SCSI disk mode, but that was on a freshly formatted drive in one single write operation of about 1 GB of data...
--
Bruce Johnson University of Arizona College of Pharmacy Information Technology Group
Institutions do not have opinions, merely customs
-- PowerBooks is sponsored by <http://lowendmac.com/> and...
Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! |
Support Low End Mac <http://lowendmac.com/lists/support.html>
PowerBooks list info: <http://lowendmac.com/lists/powerbooks.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/powerbooks%40mail.maclaunch.com/>
Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
