Device not supported . . . why? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 05-08-2017, 08:43 AM - Thread Starter
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Device not supported . . . why?

I have a very modest home TV setup that has not changed for a year or so: Sony STR-DJ7200HP TV, Sony BDP-S5200 BD player, Sony STR-DH720 A/V receiver, Dish Network satellite box. If I have a DVD movie on a flash drive, I can insert the flash drive into the USB port on the Sony BD player or the USB port on the A/V receiver or the USB port on the front of the Dish box. If I navigate to the Video_TS folder on the flash drive, I can play the movie from the flash drive. I hardly do this every day, but occasionally it is useful.

Recently I purchased a small external USB DVD-R/W drive - HP-DVD-556S. The plan was to be able to play a DVD or DVD-R disc from this drive through one of the USB ports in the system. But when I have tried this, I consistently get the message 'Device not supported'. Why? I don't think this result is unique to the HP 556S, although that's possible. There are numerous external DVD-R/W drives available - many in the $10 price range.

Why would the Dish box or any of the system devices with USB ports treat this USB DVD-ROM drive differently from a USB flash drive? Is there some intermediate cable or gizmo that I'm missing? Has anyone else tried this? Results? This outcome is not the end of the world, but I am truly puzzled as to why it occurred. Suggestions? Thanks.
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post #2 of 4 Old 05-08-2017, 10:39 AM
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Quote:
Originally Posted by dave5358 View Post
Why would the Dish box or any of the system devices with USB ports treat this USB DVD-ROM drive differently from a USB flash drive?
Because an optical drive is not the same as a hard disk or flash drive.

They use a different command set, ATAPI/MMC-2 instead of RBC. Optical discs​ also use different filesystems, so even if block commands would work the software wouldn't understand how to read the disc.

I'm not surprised support for optical drives is not included.
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post #3 of 4 Old 05-08-2017, 01:40 PM
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Why are you using an external DVD player to play DVD when the BD player can play it?

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post #4 of 4 Old 05-13-2017, 11:20 AM - Thread Starter
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Originally Posted by ST Dog View Post
They use a different command set, ATAPI/MMC-2 instead of RBC. Optical discs​ also use different filesystems, so even if block commands would work the software wouldn't understand how to read the disc.
Thanks. What I was looking for.
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