On Tue, May 26, 2009 at 06:36:09PM +0200, Stefan Richter wrote: > Matthew Dharm wrote: > > On Mon, May 25, 2009 at 01:45:54PM -0300, Rogério Brito wrote: > >> The question is: how are devices determined to be removable or not? > >> Sorry if this question is too naive. > > > > It's a bit that the device reports. The usb-storage driver passes this bit > > to the SCSI layer. > > Wasn't this bit actually about removable _media_ rather than > hotpluggable transports? (I.e. hardware where you can pull the medium > out of the drive mechanism.) So in this sense, an USB attached HDD > should actually not present itself as "removable" unless it's a SyQuest > or Zip or something like that. In fact, yes, that's the meaning of that bit. The device indicates if the storage media may be removed from the device. That said, a great many devices simply lie about this. Probably developers doing a cut-and-paste from templates which have the bit set one way or the other. The "popular" OSes don't seem to really care much about this bit... Matt -- Matthew Dharm Home: mdharm-usb@xxxxxxxxxxxxxxxxxx Maintainer, Linux USB Mass Storage Driver C: Like the Furby? DP: He gives me the creeps. Think the SPCA will take him? -- Cobb and Dust Puppy User Friendly, 1/2/1999
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