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From: WARNOCK@prism.clemson.EDU (Todd Warnock)
Newsgroups: comp.os.vms
Subject: DISK/HSC internals
Message-ID: <8708060931.AA09870@ucbvax.Berkeley.EDU>
Date: Wed, 5-Aug-87 14:44:00 EDT
Article-I.D.: ucbvax.8708060931.AA09870
Posted: Wed Aug  5 14:44:00 1987
Date-Received: Sat, 8-Aug-87 09:30:55 EDT
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Where can I find information about disk/HSC internals/architecture ?  

In particular (consider and HSC50 and RA81/RA82 drives):

	- Where does the LBN -> PBN translation occur ?
	- What are/Where are the commands that tell the drive
		to SEEK, WRITE, READ, etc. ?
	- How big is the buffer in the disk drive itself ?
		(Supposedly, the disk can field a request from
		the requestor in the HSC, read the information
		into a buffer in the disk drive, and, when the
		requestor polls the disk again, transfer the information
		to the requestor (and subsequently, to the CPU).
	- What determines how much information is pasted from the disk
		drive to the requestor ?

These, and many, many, more questions ....

Thanks for the help !


Todd Warnock
VAX Systems
Clemson University
Clemson, South Carolina 29634-2803

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