[comp.sys.next] ED Floppy MTTF ?

Ward_Travis@TRANSARC.COM (06/12/91)

Does anybody have any infomration on how long an ED floppy should last?
The one that came with my system lasted for three trips to the office
and back, and I'm bummed about that.

The symptoms are that the disk will no longer initialize in my NeXTstation
nor in a friend's.

The disk had previously been initialized by a PS/2 system at 1.44MB (HD).
I have not tried to format it again on other systems. When the system
first arrived, I initialized the ED to 2.88 Mb density with no problems.
Then I moved it down to 1.44Mb for use in hauling data back from the office.

Does anyone have any suggestions? I haven't tried bulk-erasing it, will
that accomplish anything?

In terms of environment, it lived a sheltered life, always within its
protective baggie and away from heat and moisture. I'm a little disappointed
about this, and I'm hoping to hear that this is highly unusual. Takers?

-wt

tempest@ecst.csuchico.edu (Kenneth K.F. Lui) (06/12/91)

[Ward Travis writes about an ED diskette not working anymore
(cannot initialize).  This was after a NeXTstation initialized it
fine and a PS/2 with a 1.44MB drive initialized it.]

My guess is because the diskette was re-initialized by the PS/2.
You never say whether the diskette failed to initialize after the
PS/2 formatted it or not.  Remember ED disks use different
magnetic formulation and in order to store more info, you need
less signal so adjacent bits don't interfer with one another--so
if you format with the "HD" setting from a PS/2, the signals used
for that format will be greater than those used to format in the
"ED" setting.  You ain't never gonna overcome the stronger signal
no matter how many times you format using an "ED" disk drive.
Try using a bulk eraser as a last resort.

Ken
______________________________________________________________________________
tempest@ecst.csuchico.edu, tempest@walleye.ecst.csuchico.edu,|Kenneth K.F. Lui|
tempest@sutro.sfsu.edu, tempest@wet.UUCP                     |________________|