Path: utzoo!attcan!uunet!cbmvax!steveb
From: steveb@cbmvax.UUCP (Steve Beats)
Newsgroups: comp.sys.amiga
Subject: Re: Disk-Validator failure
Message-ID: <5629@cbmvax.UUCP>
Date: 5 Jan 89 14:55:57 GMT
References: <6214@louie.udel.EDU>
Reply-To: steveb@cbmvax.UUCP (Steve Beats)
Organization: Commodore Technology, West Chester, PA
Lines: 19

In article <6214@louie.udel.EDU> version B 2.10.3 4.3bsd-beta 6/6/85; site cbmvax.UUCP cbmvax!bpa!rutgers!gatech!udel!mmdf gay%elde.epfl.ch@cunyvm.cuny.edu (David Gay) writes:
>
>P.S. A "techish" question: which io_Commands must a filing system device
>provide ? My program traps CMD_READ, CMD_WRITE and TD_FORMAT. Is that
>sufficient ?

A filing system will call a device with the following io_Commands :-

	CMD_READ
	CMD_WRITE
	CMD_FLUSH
	TD_MOTOR

In addition, the format command will use TD_FORMAT.  That's about the minimum
a device driver can get away with, though SEEK and CLEAR should be supported
too.  Oh yes, the device/library entry points that MUST be present are Init, 
Open, Close, BeginIO and Expunge.

	Steve