I am really amazed. I would have thought that only someone with a 10 year old Russian ereader would have UMS.
Even the Glow series from B&N do not use UMS, but MTP.
I use only ADB. Unlike MTP there's no flurry of communication when you connect. You can pull the cable at any time without a problem. If that was in the middle of a book, the transaction won't be completed, but the next sync will transfer it.
Seriously, UMS is ancient, but more especially, bad technology.
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