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Re: Reading CD image from CD: slow!



Hi!

Zini Enrico (zini@mail.asianet.it):
> When I try to read the ISO image from a CD, either with cat or dd, the reading
> speed (I read with a SCSI 4x/2x Philips CDD2600 cd-writer) seems to be around
> 70Kb per second (half 1x !). If I mount the CD I can read at full 4x, no
> problem: what could it be? Do I need some utility to set cd reading speed or
> such?

I suppose dd's default blocksize of 512 Byte kills performance on several
CD-Drives.

I use

 dd if=/dev/scd0 of=tmp.iso bs=2k count=$(( `isosize /dev/scd0` / 2048 ))

which is reasonable fast (and avoids reading the unreadable sectors at the
end)



Rainer

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