mkfs gap option

0000-Admin0000 root at maxed
Thu May 3 00:44:52 AEST 1990


In article <715 at bilver.UUCP> bill at bilver.UUCP (Bill Vermillion) writes:
>In article <PCG.90Apr30221039 at odin.cs.aber.ac.uk< pcg at cs.aber.ac.uk (Piercarlo Grandi) writes:
><
><In article <1990Apr29.000503.10934 at nebulus.UUCP> dennis at nebulus.UUCP
><(Dennis S. Breckenridge) writes:
><
><   pcg at cs.aber.ac.uk (Piercarlo Grandi) writes:
><
><   >Essentially the gap size depends on rotational speed of the disc
><   >(virtually a constant), and on interrupt latency and IO operation
><    ^^^^^^^^^^^^^^^^^^^^^^ What is this? Different drives have DIFFERENT
><    speeds. Even the same supplier does NOT adhere to the same speeds. 
><
><Bah. Virtually every drive around does 3600 RPM, for an average
><rotational latency of 8.3 ms. Exceptions I know are the optical drives
><(slower, they have a limit in the state changes/sec. of their
><head/medium).
>
>And just last week I was looking over the specs on the current Shugart lines,
>and there were 3 different drive rotational speeds listed.
>
>All were SCSI drives.  Since we just talk to the host in SCSI land it really
>doesn't make any difference to us.  And many of the new SCSI's are using zone
>bit recording - so we don't know much about the data, execpt it's block #.

Many of the new 20 and 25 MHz ESDI & SCSI drives are turning at
5400 rpm. Latency and access times are reduced. Can't count on 3600
any more.
-- 
 Ed Whittemore 		uunet!maxed!ed
 American Micro Group 		201 944 3293



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