Re: Difference between dvd and dmg
Re: Difference between dvd and dmg
- Subject: Re: Difference between dvd and dmg
- From: John Stiles <email@hidden>
- Date: Wed, 12 Oct 2005 09:08:34 -0700
Gerriet M. Denkmann wrote:
Because pread() wants both nbr_of_bytes and byte_offset to be a
multiple of the hardware value, which seems to be 512 in case of my
hard disk, and 2048 for cds and dvds.
Somehow I failed to see this on the pread man page.
What can I do to make it work?
Use appropriate values (see above).
Or, if this is impossible: how can I recognize beforehand those
filesystems which do not work with pread?
That now becomes a new question:
how to get this hardware value (hardware block-size?) before trying to
read?
This may be an artifact of opening up the /dev/rdisk directly.
With a regular file, pread works even when the requested data is not
sector-aligned.
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