Re: dd if=/dev/rdisk12 of=/dev/zero (OT, since macOS)

Reply: Christoph Kukulies : "Re: dd if=/dev/rdisk12 of=/dev/zero (OT, since macOS)"
In reply to: Christoph Kukulies : "Re: dd if=/dev/rdisk12 of=/dev/zero (OT, since macOS)"
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From: Marco Moock <mm_at_dorfdsl.de>
Date: Sun, 02 Nov 2025 09:21:40 UTC

Am 02.11.2025 um 10:09:17 Uhr schrieb Christoph Kukulies:

> It came to memory again when I recalled that I had a similar problem
> with the attempt to dump (dd) a CD device. One has to specify bs=2048
> with CDROMs.

This is rather strange, as I experienced under Linux that reading block
devices (CD is character dev in Linux) is possible with a different
block size from the size the device reports to the storage controller.

The actual block size of the device might be different from those that
is being reported to the storage controller, see 512e disks.

-- 
Gruß
Marco

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