Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: How can I Reset or delete all the files and playlists? Would  like to reset my unit and start putting new music ,My subscription expired and I don't want to renew it, just want to put all the music i have in my desktop and transfer it to the sandisk but the memory is full with the old playlists, I simply can't see playlists in the computer or delete them
Document: Even files ripped from a CD to your computer are difficult to transfer to Sony's format if they were weren't originally stored that way!! The Sansa not only had all of the features that I wanted, it also had picture capability as well as voice recording and FM radio. I-Pod and Sony have been resting on their laurels...try the new SanDisk. It beats all of the competition out there!
I have not tried putting video on it either.Dislikes:  no delete option while the song is playing (this option is available on the Sansa Fuse) and have to use Windows Media Player to create a play list (play list cannot be created on MP3 player itself)Otherwise I would recommend this to other people who are looking to just put music on an MP3 player and not using it for multiple purposes. Works well and sounds great.
They must b/c I don't know how they're all so happy with it.I'm not going to write a long diatribe here, but I want to caution potential buyers of the e270.For starters, it's NOT compatible with Napster To Go nor Y! Music Unlimited To Go subscription-based services. It is compatible with Rhapsody, but set up is difficult and you MUST HAVE USB 2.0 on your computer. The MTC protocol (see, I told you it is difficult. . .
I took a long time finding a new mp3 players. My old one is a Phillips CD/Mp3 player from years and years ago, that is actually still going strong, but it's big and I had to burn mp3's to a cd to use it.I have an extensive mp3 collection, and i didn't want to convert everything to another format (like the ipods require), and I wanted something easy to use and be able to just drag and drop files.
Then the player would also try to "arrange" my MP3s to fit its filing methodology, which just seemed to screw up my playlist. I could not find a lot of my music files after the "arrangement". I also found that I couldn't delete tracks on the player - I had to plug it into my computer and delete it using the computer interface.
This MP3 Player is very easy to use, just plug it into your computer and off you go. Simple to add and delete songs as desired. Works like a flash drive on your computer. Ergonomics are good also. Light and simple to operate. Support help line at SanDisk was very helpful when I had a problem as they stepped me thru to get the problem fixed. Software that compresses photo's is very useful for not filling up the unit.
Being a music junkie, I love this product because it fulfilled what it promised. With 6 GB of space, I felt like I could put in all the music that I wanted and more. To date, I saved around 500 songs; and I still have space for a thousand more!The video quality is top-notch. And although video files are supposed to be converted first (as well as photos), I think that's forgivable given that I can transfer songs without downloading a program.
When I first bought it, I had an issue getting a playlist on because I didn't know you had to use Rhapsody, but since then, I started putting playlists on... that is, until the firmware update. THIS IS SOMETHING I HIGHLY RECOMMEND STAYING AWAY FROM!!!! I can't get a single playlist on the unit now... AT ALL! I've used rhapsody, and now it even enables you to use WMP 10 OR 11, and still nothing.
playlists or compilation albums cannot exist here. Songs are listed by Artist, Album and a full list of Songs. But, for someone who arranges songs in a certain way, you wouldnt like the fact that you cant play your compilation album the way you want it.Given all these, I give the Sansa e270 a rating of 4 stars. A very good buy if you're not quite particular about small misgivings.
The 6GB storage is large enough that you no longer need a hard drive device which means you get player with great battery life and able to stand up to knocks without skipping / breaking. If you have a lot of purchased music or CDs on your computer, then this is the MP3 player for you - (see my warning below about subscription services!
Answer: first hook up your unit to your computer and go to the Music file on the unit. delete the music folder. Then delete the "tmp" folder on both the MSC mode and the MTP mode. This should delete the playlists as well as the songs.