NetNews Usenet Archive 1992 #27/NN_1992_27.iso/spool/comp/arch/storage/792

Text File | 1992-11-20 | 1.2 KB | 39 lines

Newsgroups: comp.arch.storage
Path: sparky!uunet!cton!torre
From: torre@mom (Patrick Torre)
Subject: LBA modes on IDE drives?
Message-ID: <[e-mail]>
Sender: @cton.com
Organization: Computone Corp., Roswell, GA, USA
Date: Fri, 20 Nov 92 19:07:35 GMT
Lines: 28


I'm trying to find an IDE drive that supports LBA addressing mode.
Do any of the popular (cheap) drives support this mode?

(this is from the ATA spec.)

)A drive can operate in either of two addressing modes, CHS or LBA, on a
)command by command basis. A drive which can support LBA mode indicates this in
)the Identify Drive Information. If the host selects LBA mode in the Drive/Head
)register, Sector Number, Cylinder Low, Cylinder High and HS3-HS0 of the
)Drive/Head Register contains the zero based-LBA.
)
)In LBA mode, the sectors on the drive are assumed to be linearly mapped with
)an Inital definition of:
)
)        LBA 0 = Cylinder 0/Head 0/Sector 1.
)
)Irrespective of translate mode geometry set by the host, the LBA address of a
)given sector does not change:
)
)  LBA = [ (Cylinder * No of Heads + Heads) * Sectors/Track ] + (Sector-1)
)
)


Any help will be appreciated,
Pat