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How do you calculate the sha1 of a CD-ROM disc under MacOS X?

On Linux (RedHat) I use sha1sum /dev/cdrom.

How do I do the same thing on Mac using openssl sha1?

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To find out which dev is your DVD drive, enter mount and look for the volume name of the DVD you inserted. Alternatively, look it up in Disk Utility » File » Get Info » Entry Path.

Then you need to unmount the volume (not eject the device). Open Disk Utility, select the volume (not the device) in the list, right-click, and select Unmount "Name of Disk".

Then you can use

$ openssl sha1 /dev/disk6
SHA1(/dev/disk6)= ee099db39922cf2d14282a8957f9243e092809e8
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I don't have a Linux system here to compare results. Please let me know if these are wrong. Also try disk6s1 or another of the "sub-devices" in that case. – Daniel Beck Apr 20 '11 at 6:31
To get the md5 check sum, the same steps are required. md5sum doesn't work on devices, so use cat /dev/disk6 | md5 instead. – Daniel Beck Apr 20 '11 at 6:33
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