[comp.periphs] How do you get a prime number of sectors per cylinder?

matt@beatnix.UUCP (Matthew D. Shaver) (03/17/88)

Here is a strange one for you.  (At least I find it strange.) The Seagate
ST251N (SCSI) drive has the following statistics:

    sectors per track     26
    data surfaces          4
    sectors per cylinder 103

Now 4 times 26 equals 104 so where does that extra sector go?  Are they
using it for something special?

                       Thanks, Matthew.
==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==
Matthew D. Shaver --- UUCP: ..!{sun|lll-tis}!elxsi!beatnix!matt
                      USPS: ELXSI Ltd., 2334 Lundy Pl., San Jose, CA 95131
                      BELL: (408) 942-0900

cwwj@ur-tut (Clarence Wilkerson) (03/19/88)

On my scsi disk, the first physical sector is numbered 0, not 1.]

leonard@bucket.UUCP (Leonard Erickson) (03/22/88)

In article <749@elxsi.UUCP> matt@beatnix.UUCP (Matthew D. Shaver) writes:
<
<Here is a strange one for you.  (At least I find it strange.) The Seagate
<ST251N (SCSI) drive has the following statistics:
<
<    sectors per track     26
<    data surfaces          4
<    sectors per cylinder 103
<
<Now 4 times 26 equals 104 so where does that extra sector go?  Are they
<using it for something special?

Well, I spent most of Friday installing and low-level formatting
ST-251 disks (ST-506 interface). They've got *6* heads and 820 cylinders.
I suspect that the controller on the HD is lying to the SCSI controller
for some reason.

Maybe those are "logical" cylinders, not physical?

-- 
Leonard Erickson		...!tektronix!reed!percival!bucket!leonard
CIS: [70465,203]
"I used to be a hacker. Now I'm a 'microcomputer specialist'.
You know... I'd rather be a hacker."