I formatted a sandisk sansa with a mac and it

Hello,
Here's a page showing links how to reconnect the player to the MAC Operating System and how to use iTunes for the e200 series:
http://kb.sandisk.com/app/answers/detail/a_id/229/kw/mac/p/555%2C618/r_id/101834

When the firmware on the player has been erased, a download and reinstallation of the firmware has to be performed.

The Sansa Firmware Updater can only be used on Windows based systems: So get the firmware directly from this site : http://forums.sandisk.com/sansa/board?board.id=e200
Check the version of your player to get the matching download.

e.g. selecting e200 v2 there's one download for America; 2 downloads for Europe, one without FM (radio) and one with FM.
Read the instructions on the sandisk forums site for the players recovery.

Need more help ? Just post a comment.