After seeing my boyfriend's e280 running Rockbox, I wanted in on the fun. He went to Costco on Black Friday no less (I feel the love!) and bought me what we thought was an e280 and it appears it's a v2. I had emailed Sandisk's support asking how to put the player in MSC mode. This was their response:
"Thank you for contacting SanDisk Technical Support, and for your recent inquiry into our product line.
The player you have is e200 version2, it only has one mode, the MTP mode.
Should you have any further inquiries or concerns, please do not hesitate to contact us via Email.
Anthony John Miles G.
SanDisk Technical Support"
Bah. In the Settings menu there's no USB mode. The firmware is 3.01.11A just like the previously mentioned e250. Sucky.