25 Nov
2009
25 Nov
'09
1:18 p.m.
On Nov 24, 2009, at 1:08 PM, geoffrey oltmans wrote:
I qwould be very careful about dismantling the pack for another reason.
Often there is no automatic centring of the platters. If you seprate
them, you will have to centre them up. On the (crashed) 5-platter pack I
dismantled about 25 years ago (for interest), there were holes throuch
the top and bottom hparts of the hub through which you put long rods to
keep the platters and spacers _approximately_ cententerd. But then, I
think, you have to put the hu on the drive spindle (or a similar spindle
in a test rig) nd use a dial gauge to position the platters so there's
no run-out when you rotate the stack by hand. Given that moving one
platter is likely to slightly move all the others, this is a long and
tedious job.
-tony
Dumb question (perhaps), but do the relative
positions of the disk
platters in the pack matter on these systems? I suppose it might for
interleaving purposes for data already recorded.
I would suspect yes but never having cleaned multi-platter packs, I'd
only do that on packs that I don't care about the data (ie I'm going
to format the pack as soon as it's "clean"). If I care about the data
that *might* be on them I probably wouldn't disassemble (ie de-stack)
the pack.