Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ogicse!blake!unicorn!csispt!bob
From: bob@csispt.UUCP (Bob Finch)
Newsgroups: comp.sys.mac.programmer
Subject: Hardware write protect in SCSI disk driver
Keywords: write protect, lock, SCSI, driver, disk
Message-ID: <1989Dec7.202804.6903@csispt.UUCP>
Date: 7 Dec 89 20:28:04 GMT
Reply-To: bob@csispt.UUCP (Bob Finch)
Organization: AlphaSoft, Bellingham, WA
Lines: 15


How should a SCSI disk driver that supports removable media tell the
Mac OS that the drive is hardware write protected?

I've tried setting bit 7 in byte 0 of the flags that precede the drive
queue element for my drive (IM IV page 181) in a VBL task when a disk
is inserted just before doing a PostEvent to get it mounted.

I've also tried responding to drvStsCode (csCode 8) Status calls with
DrvSts record with writeProt bit 7 set (IM II page 215).

Thanks in advance...

--
Bob Finch   bob%csispt.UUCP@unicorn.wwu.edu   +1 (206) 671-6214