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I did

dd if=/dev/disk2 of="disk 1".iso bs=1m

where disk2 is a DVD video. After about 30 minutes, dd spewed out the usual message of

7662+1 records in
7662+1 records out
8034680832 bytes transferred in 2007.685274 secs (4001962 bytes/sec)

but I didn't get my prompt back. I checked (from another shell) and the image was 800+Meg and growing. It is now 6.7G and still growing and I figure somewhere something has a ton of data stored. Perhaps dd forks with one process reading and the other process writing with the data between the two going over a pipe. But, this is new with Catalina.

Has anyone seen this before? Is there a way to speed things up? This is going to end up taking over an hour to copy one DVD. This is on a laptop and the hard drive is an SSD.

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  • Is this a movie DVD which may imploy some crazy copy protection scheme?
    – nohillside ♦
    Commented Aug 9, 2020 at 15:17
  • I don't think so. It is from the History Channel, produced around 2000, and HandBrake, etc all seem to understand the iso images just fine.
    – pedz
    Commented Aug 10, 2020 at 16:22

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