The early firmware for version 2 units (firmware version information is under Settings Â» Info) removed the ability for unsupported operating systems (Linux, FreeBSD, etc.) to see the internal storage as a standard flash drive when plugged in via the USB port. Version 1 players had a menu option under the Settings menu for storage mode that could be toggled to show up as standard USB flash drive. For V2 Sansa players with firmware version V03.01.11, this option has been completely removed from the settings menu. Upgrading to later firmware versions, V03.01.14 or V03.01.16 will restore the USB Mode menu option under the Settings menu. Under the USB Mode menu are three choices - Auto Detect, Media Transfer Protocol (MTP), and USB mass-storage class (MSC). MSC is Mass Storage Class where the computer would see the Sansa as a regular flash drive. MTP is Media Transfer Protocol which is a Microsoft-specific mode invented to deal with media files that include Digital Rights Management.