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PostPosted: Tue Mar 06, 2018 10:14 am 
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Joined: Sun Feb 18, 2018 7:42 am
Posts: 4
Location: /usa/utah
So, Blu-ray drives have different read speeds. Spec says a 1x can read at 32 Mbits / second, or, 4.5 megabytes.

Is there a way though to detect the read-speed of an optical drive in Linux that anyone knows of?


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PostPosted: Wed Mar 28, 2018 4:47 am 
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Joined: Sun Feb 18, 2018 7:42 am
Posts: 4
Location: /usa/utah
Okay, I figured it out.

Put a Blu-ray disc in your tray (not DVD or CD, they will report different speeds), and run cdrdao:

Code:
cdrecord -prcap


Here's a snippet from mine:

Code:
  Maximum read  speed: 17982 kB/s (CD 102x, DVD 12x, BD  4x)
  Current read  speed: 17982 kB/s (CD 102x, DVD 12x, BD  4x)
  Maximum write speed:     0 kB/s (CD   0x, DVD  0x, BD  0x)
  Current write speed:     0 kB/s (CD   0x, DVD  0x, BD  0x)


Mine's an older drive, so it's only 4x reading speed.

Blu-ray spec is 4.5 MB/s (1024k notation), so mine is reading at 18 MB/s total. :)

Note that cdrdao uses 1000 notation for kilos, which is why the number is lower. See http://www.matisse.net/bitcalc/


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