Well, i'm going to assume your MP3 player is just another storage device and you should be able to just open it up. Right click on the "Removable Disk (F:)" icon. Select open or explore. Drag mp3's into music directory.

Greetings, I don’t have any problem formatting the same device. I can’t say I remember, whether or not I had installed any of the software that SanDisk included. Probably not. Windoze XP detects the device via USB, and it’s protocol just fine. And I am able to interact the filesystem maintained within the flash memory of the device. However, one peculiarity that I do observe, is that the filesystem does not get mounted into the XP filesystem on the PC (e.g. E:, F:, G:, etc), in a fashion similar to the manner in which other filesystems that are maintained on other devices (harddrives, floppies, flasdrives, etc). I am able to get to filesystem on the device via the Windoze Explorer, but NO OTHER WAY? It does not appear via the ‘mount’ command from a command shell. Nor as a Windoze drive. A new label is added to the PC filesystem, at the topmost level of the filesystem, after plugging the device in. Windoze XP seems to ‘know’ how to interact with the filesystem hosted on the device, but the PC filesystem doesn’t seem to be involved. That is, access to the filesystem on the m230 seems to be direct via the driver, which has been programmed to interact with the m230 device, via an electrical signaling protocol through USB; where the data returned, is then made to appear in a fashion similar to the manner in which filesystem data looks within Windoze Explorer. It appears that the filesystem mechanics may not actually be involved? This actual, functional behavior, is different than the behavior that has been previously described at the thread start. Which states that the device is being recognized, and the filesystem maintained on the device IS getting mounted through the PC filesystem; as another Windoze drive (i.e. E:, F:, G:, etc).

Windows XP puts the Sansa drive into MTP mode by default. (see: http://en.wikipedia.org/wiki/Media_Transfer_Protocol) In order for the Sansa device to be seen as a drive letter, it needs to be in MSC mode. OK, enough background! On your Sansa device, go to Menu | Settings | USB and select MSC. Once you exit the menu and connect the device to your Windows XP machine it should be recognized as a drive letter. This method worked for my Sansa M240. Hope this helps! David

I was having the same problem and I took Talldavids advice and changed the settings and could get to view my files and erase the old ones that were on the mp3 player. I could not do this before I changed it though.