Date: Fri, 2 Nov 2001 23:34:33 +0100 (CET) From: Nils Holland <nils@tisys.org> To: David Kelly <dkelly@hiwaay.net> Cc: Jim Arnold <jim@ohio.com>, Cliff Sarginson <cliff@raggedclown.net>, <freebsd-questions@FreeBSD.ORG> Subject: Re: Splitting a tar archive Message-ID: <20011102232955.W1449-100000@howie.ncptiddische.net> In-Reply-To: <20011102155013.B60019@grumpy.dyndns.org>
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On Fri, 2 Nov 2001, David Kelly wrote: > The problem with this method is (I've noticed) some CD drives report > end of media with the block of data which has touched EOM and possibly > the read returned less than a full buffer, and others report EOM only > after one has attempted to read past EOM and no data was returned. So > its possible to lose the last block with some drives. Noticed this > when I wanted to verify a FreeBSD ISO by lifting it raw off of the > disk with dd. Philips ATAPI CD-RW read short. HP SCSI CD-RW read > correctly. Believe Sony ATAPI CD-RW read correctly. That problem (at least I guess that it's that problem) has occured here in the following way: When creating a multi-volume tar archive and burning the individual pieces to CD in RAW mode (i.e. not as an ISO fs), then restoring tends to be problematic - at least on my CD-ROM drive. If I try to restore from the first CD of a "raw" multi-volume tar CD-set, I get a lot of read errors at the end of the first CD. In fact, tar aborts after a large number of errors - it never noticed that it has reached the end of the first CD and should ask for the second CD. As a solution, I have to make an ISO out of each piece of the multi-volume archive. I have not yet been able to clearly find out if this is an issue with my CD-ROM driver or if it's generally impossible to put multi-volume tars onto CD as raw data... Greetings Nils Nils Holland Ti Systems - FreeBSD in Tiddische, Germany http://www.tisys.org * nils@tisys.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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