SUMMARY : solaris format seeing IBM 18GB disk as providing only 17GB

From: Jeff Cobb (
Date: Wed Jul 26 2000 - 19:04:46 CDT

My original post:

> Hi Managers,
> I recently installed an IBM 18GB drive on a Solaris 7 box. The drive type
> is DGHS-318220. It's an "Ultrastar". When I used format to label and
> partition the drive, it said:
> Searching for disks...
> Mode sense page(3) reports nsect value as 280, adjusting it to 219
> c3t0d0: configured with capacity of 17.03GB
> The specs I find at:
> indeed say that nsect is 219. However, it also says that the ncyl is 8160 (plus 2 alt).
> Solaris format says that ncyl for this drive is 8152 (plus 2 alt). But of course
> adding 8 cylinders will not give me a GB of additional capacity. The formatted
> capacity should be ~ 18GB.
> Does anyone know how I can get this GB back?

Well, I should have done the arithmetic. The drive spec indicated that
the capacity was more than 18 billion bytes and I was thrown off by the
Mode sense message. But when I divided the capacity by 1 GB (1024^3),
it came out close enough to the 17GB that format indicated.

Thanks go to :
Kevin Buterbaugh <>
David H. Brierley <>
for pointing out the obvious!

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