physical block size > 512 bytes
martin at idca.tds.PHILIPS.nl
Mon Mar 26 21:05:07 AEST 1990
Does anyone know how existing UNIX device drivers handle physical block
sizes that exceed 512 bytes? For example, Exabyte cartridges use a
block size of 1 kilobyte by default. Two approaches are possible in case
the I/O is not a multiple of the physical block size:
1. An I/O of 512 bytes is written as 1 physical block.
2. The driver uses blocking to combine 2 I/O's of 512 bytes into
1 physical block.
Obviously, the different approaches lead to incompatibility e.g. when
labelit/volcopy is used.
Thanks in advance,
Internet: martin at idca.tds.philips.nl UUCP: ...!mcvax!philapd!martin
Tel: +31 5543 3163 Fax: +31 5543 3488 Telex: 36345 phl nl
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