Date: Thu, 26 Dec 1996 11:14:53 -0800 From: Julian Elischer <julian@whistle.com> To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de> Cc: FreeBSD-current users <freebsd-current@FreeBSD.ORG> Subject: Re: DAT: reading with blocksize=256K Message-ID: <32C2CEAD.794BDF32@whistle.com> References: <199612261827.TAA03226@uriah.heep.sax.de>
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J Wunsch wrote: > > As Heikki Suonsivu wrote: > > > I have been able to read my old backups written with 1024k blocksize. They > > secret was to use ddd instead of dd. > > This must be unrelated to the other problem. If they were written > with 1024 K blocksize on a FreeBSD machine, they were actually written > with 64 KB instead. The limit is in physio(9) (UTSL), and could not > be changed by whatever trickery from a userland program. > OR the drive is in fixed block mode. in FIXED block mode what is actually written to tape is fixed blocks and many are written at a time for a large read/write thus you can read and write differnt blocksizes because it always ends up a multiple of hte smaller blocksize anyway.. julian
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