Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!killer!tness7!tness1!splut!jay
From: jay@splut.UUCP (Jay "you ignorant splut!" Maynard)
Newsgroups: comp.arch
Subject: Re: Why no disks with two HDAs ?
Keywords: diskdrives, headdiskassemblies
Message-ID: <552@splut.UUCP>
Date: 25 Jun 88 16:53:54 GMT
References: <2351@uklirb.UUCP> <2440@winchester.mips.COM> <2451@winchester.mips.COM>
Reply-To: jay@splut.UUCP (Jay "you ignorant splut!" Maynard)
Organization: Confederate Microsystems, League City, TX
Lines: 20

In article <2451@winchester.mips.COM> cprice@winchester.UUCP (Charlie Price) writes:
>>The original 3380 had 1.25 Mbyte HDAs, the 3380E has 2.5 MByte HDAs,
>>and the current drives (number unknown) are 3.75 Mbyte HDAs.
                          ^^^^=3380K
>I meant, of course, GigaBytes.

Each HDA in a 3380 (of any series) has two actuators, each with an equal
amount of cylinders accessible. The capacity is increased by increasing
the number of cylinders: the 3380A/B/Ds have 885 cylinders of 15 tracks
of 47476 bytes each, the 3380E/Js have 1770 cylinders, and the 3380Ks
have 2655 cylinders. Each 3380 box has two HDAs, or four logical
volumes; you can hang four boxes on a string, for a total of 16 volumes
of over 30 GB per string.
(Side note: my not-too-small shop only has 17 GB total of 3350 space...)

-- 
Jay Maynard, EMT-P, K5ZC...>splut!< | Never ascribe to malice that which can
uucp:       uunet!nuchat!           | adequately be explained by stupidity.
   hoptoad!academ!uhnix1!splut!jay  +----------------------------------------
{killer,bellcore}!tness1!           | Birthright Party '88: let's get spaced!