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USB Inputs seem very fussy on input devices
copierman
09-04-2008
A lot of entertainment equipment has USB input sockets these days ie, DVD/HD recorders, Satellite boxes, car radios, DAB Radios etc. My question is has anyone got a definitive answer as to why some ipods and USB memory sticks will work and others wont.
sancheeez
09-04-2008
Generally speaking, if something accepts USB devices, it will only be able to read them if they are UMS (Universal Mass Storage .... common term for USB Mass Storage Class) compliant.

The whole point of UMS storage devices is that should be plug in and go. No drivers, software etc required.

An iPod is partially UMS. You can use it as a removable drive and add and remove data to it but if you add an MP3 to it, it won't play it. In order to actually play an MP3, it has to be added through iTunes or similar as it uses a database structure to navigate any music stored in a device.

Some digital cameras are UMS compliant, others aren't. So when you plug a UMS type camera into a USB host device, it should be able to see all the photos on it.

Other devices (Canon cameras being one) are not UMS compliant so attach them to a USB host and it won't be able to read anything from it. The card is readable in a card reader but not while in the device.

Such devices will normally rely on propriatary software in order to read directly from then when connected to a computer.

So, plug a USB stick into a Divx DVD player and it should be able to read it. Plug an iPod in and it probably won't be able to play the music on it ...... unless the player has firmware set up to read an iPods on-board database.

http://en.wikipedia.org/wiki/USB_mas...e_device_class
copierman
11-04-2008
Many thanks for the info
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