NOTE: MAC computers do NOT support MTP modes of USB conectivity in a MP player.
A Sansa player in MTP mode when plugged into a MAC computer will NOT be detected or recognized.
MAC computers supports Sansa players in MSC mode
Sansa players can only be recognized by a MAC if the USB mode on the Sansa player is set to Auto Detect or MSC.
Check in the System Profiler
Open System Profiler from the Utilities folder, which is inside the Applications folder. From the Contents column on the left, under the Hardware header, select USB; the panel to the right will show all the USB devices that the computer recognizes. It may not identify them correctly by name, but it should have the right number of devices listed.
. Navigate to USB Mode settings.
- From the Main Menu, select More > Settings/Options > System Settings > USB Mode.
Sansa Fuze and Sansa Clip+
- From the Main Menu, select Settings > System Settings > USB Mode.
Sansa Clip, e200v1 series, e200v2 series and e200R
- From the Main Menu, select Settings > USB Mode.
2. Select Auto Detect, MTP or MSC.
e200R - PlayforSure is MTP and Rhapsody is MSC
See this tip posted here on this site for a better explanation on the modes - MTP and MSC.
Solve your MP3 Player Connection Problem.