the beginning of the end for floppies
cclist at sydex.com
Thu Apr 29 02:41:18 CDT 2010
On 29 Apr 2010 at 9:11, Jochen Kunz wrote:
> 8" flppies where already gone and replaced by 5.25", when I got my
> fingers on a computer for the first time. --
8" floppies are quite reliable. I routinely get 30+ year old disks
in and rarely have a problem with data errors.
Although I do have an odd case before me. The subject floppies are
from a Schlumberger wafer tester. What was sent were hard-sector (32
sector) floppies, but the data is definitely soft-sector (i.e. the
sectors don't line up with the sector holes and use address marks
(i.e. A1 with a missing clock) to demarcate sector headers and
sector data.) My guess is that the drive was set up to handle hard
sectored media., so that the controller still sees only one index
The sector address headers, rather than use CHRN type information,
use 2 bytes to number the sectors on the disk consecutively.
The odd thing is that on a few floppies, the data (and address
headers) is in the wrong place for that cylinder (e.g., track 3
contains the same address headers and data as track 9). I'm trying
to figure out if it's the customer's drive or his software (he's
halfway around the world from me).
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