Date: Wed, 15 Dec 1999 10:09:56 +0100 From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-scsi@FreeBSD.ORG Subject: Re: filemarks? Message-ID: <19991215100956.30691@uriah.heep.sax.de> In-Reply-To: <19991212223611.A53246@theatre.sax.de>; from Martin Welk on Sun, Dec 12, 1999 at 10:36:11PM %2B0100 References: <E11wwsG-0001fn-00@rip.psg.com> <19991212082403.A34441@theatre.sax.de> <E11xAe8-0002q1-00@rip.psg.com> <19991212223611.A53246@theatre.sax.de>
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As Martin Welk wrote: > However, it worked fine, although some of the CD-ROMs I was going to > use were not ISO compliant, so a friend of mine in Dresden (who > brought FreeBSD to me and me to FreeBSD) helped me with some kernel > patch and I was happy again. Hehe, you know that friend from Dresden? I do. :-) Since that time, FreeBSD understands ancient High-Sierra CDs. ;-) > Usually, there are two filemarks written to the tape, but there are > devices ``that can only write 1'' (man page for mt, there is furtter > informations). Actually, they can all write 2, but on QIC & alike (don't know for the newer Tandberg MLRs) you cannot go to EOM, then backspace over the second of the filemarks, and try writing from there -- you'll get a `write append error'. I think all other drives can do this, and the drive in question here was DDS, so it should be able to work with 2 FMs. Btw., Matt, wouldn't it make sense to automatically turn the driver into 1 FM mode for any "TANDBERG" drive? I don't know how their DLTs are announcing, though... Anything else they're building is QIC or upwards compatible, and AFAIK they are the only vendor still producing QIC drives at all. And please, default to variable mode for all the larger QIC drives... :) Actually, i'd rather see the historical FreeBSD behaviour restored where the default was variable for any QIC cartridge >= 525, and 512-byte fixed for anything up to QIC-150. Sure, this requires to read one block until the drive will announce an actual density, but this algorithm used to work well in previous versions of FreeBSD, and you have to spend the time for ``logging in'' the tape once per mount session anyway, so it doesn't matter. (This can take a bit of time on a larger QIC medium, i know.) -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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