Xref: utzoo comp.sys.ibm.pc:17768 comp.unix.xenix:2897
Path: utzoo!utgpu!water!watmath!clyde!att!rutgers!gatech!uflorida!usfvax2!tscs!gerard
From: gerard@tscs.UUCP (Stephen M. Gerard)
Newsgroups: comp.sys.ibm.pc,comp.unix.xenix
Subject: Re: Building Xenix 2.2.1 and partitions...
Message-ID: <203@tscs.UUCP>
Date: 4 Aug 88 22:57:14 GMT
References: <1411@sbcs.sunysb.edu> <2172@cadovax.UUCP>
Reply-To: gerard@tscs.UUCP (Stephen M. Gerard)
Organization: Total Support Computer Systems, Tampa, Florida
Lines: 25

In article <2172@cadovax.UUCP> mitchell@cadovax.UUCP (Mitchell Lerner) writes:
>I recently installed a MAXTOR 1085 HD in my Wyse AT and installed SCO Xenix 
>
>Why did I get only ~~71 usable MB out of my 85MB MAXTOR?

The Maxtor 1085 has the following geometry:
Cylinders: 1024
R/W Heads:    8

To calculate the usable capacity of a disk use the following formula:

UsableCapacity = Cylinders * Heads * SectorSize * SectorsPerTrack

So:

71,303,168 = 1024 * 8 * 512 * 17

71,303,168 Bytes = 68.00 Megabytes

CAVEAT EMPTOR:
-------------

1 Megabyte = 1,048,576 bytes  NOT  1,000,000 bytes

Most vendors don't appear to know the difference!