Hard disk parameters....

[Greg A. Woods]

In article <1283 at gagme.chi.il.us> greg at gagme.chi.il.us (Gregory Gulik) writes:
> It's a full height hard drive that has labels from
> both CDC and AT&T on it.  There is a stamp that says
> 67 Meg on the top.  What are the parameters that I need
> to give to idtools to format it???

Uh, it would help if you told us what *all* the labels said in detail.

I would guess that it is actually a CDC Wren II 72 Mb drive with 9
heads, and 905 cylinders -- but check the idtools manual.  The 3b1
manual notes a Miniscribe "67 Mb" drive with 8 heads and 1024
cylinders which you could also use.

If you've been reading in comp.sys.3b1 lately, then you will have seen
all the various discussions about why AT&T label the 3b1 drive as 67 Mb
(w.r.t. the 3b1) while CDC call it a 72 Mb drive.

The maximum usable bytes with ST-506/MFM format would be:

	CDC:		9 * 905 * 18 * 512 = 75,064,320 bytes
	Miniscribe:	8 * 1024 * 18 * 512 = 75,497,472 bytes

> Is this the infamous drive that is often found in 3B1's???

Or it's the standard 3b2 drive (72 Mb) -- they are almost identical.

Note that the 3b1 only "uses" 16 (512 byte) sectors per track while
the 3b2 is quite happy to use the maximum of 18.

> Please reply by E-mail.

Oops!  :-)  (I'll forward it too)
-- 
							Greg A. Woods
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Political speech and writing are largely the defense of the indefensible-ORWELL