Summary: Fujitsu M2654SA disks - 2 Gb ???

From: Pat Macdonald (pam@ccu.umanitoba.ca)
Date: Wed Apr 07 1993 - 13:33:19 CDT


>Subject:Fujitsu M2654SA disks - 2 Gb ?????

>We recently purchased some Fujitsu disk drives, model M2654SA. According
>to the manual the drive specifications are:
>1944 cyl, 20 heads, 96 sect, 2400 Mb unformatted
>Now (1944 - 2) * 20 * 96 = 3728640 sectors or approx 1.86 Gb formatted.
>This seems to be a rather large overhead. Can somebody out there comment?
>--
I received the following responses, all slight variations on a theme:

1) Five minutes ago I got a FAX of the M2654SA spec sheet:
   Unformatted capacity 2419
   No. of disks 12
   No of Read/Write heads 21
   Track capacity 52864
   No of cylinders 2179
   No of sectors 88

2) We recently installed this disk, and here are the parameters the technician
   used:
 
   disk_type = "Fujitsu M2654SA" \
   : ctlr = SCSI : ncyl = 2170 : acyl = 2 : pcyl = 2178 : nhead = 21 \
   : nsect = 88 : rpm = 5400 : bpt = 45056
 
   I assume this is the info he got from the supplier.

3) This is the format.dat entry we use:

   disk_type = "Fujitsu M2654SA" \
   : ctlr = MD21 : fmt_time = 4 : ncyl = 2174 : acyl = 2 : pcyl = 2197 \
   : nhead = 21 : nsect = 88 : rpm = 5400 : bpt = 52864

   This gives 2174*21*88 = 4017552
   We called Fujitsu directly to get these numbers (we were given some bogus
   parameters originally).

After experimenting with various combinations of these I eventually went with
number 2.
My thanks to Dave Martin, Mark Gastel, Daniel Nesmith and Matthew Lee.

-- 
Pat Macdonald, Computer Services, University of Manitoba
Phone: (204) 474-9870                FAX: (204) 275-5420



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