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!