Sorry if this review is long winded, but I'm going to tell you everything about my buying experience!
Was a little bit nervous buying this after reading some of the other reviews, but it IS cheap.
1st delivery arrived and I started to copy files onto it. It kept losing power (the blue light went off) and disappearing from my computer after a few minutes of transfer, but switching it off and on again showed that files were copied across. If you've read the other reviews here you'll know about FAT32 and NTSF drive formats. I didn't realise that the 4GB limit is the TOTAL file size - not each individual file size. So I thought this may be the problem and reformatted to NTFS (right click, Format, Quick Format, no problems). Tried again, but same problem. Followed the Western Digital advice and contacted them, rather than returning the product to the 'shop' I bought it from. Have still not had any response from them and have in the meantime returned the drive to, and got a replacement from Amazon.
2nd Drive arrived. Formatted immediately to NTFS. Transferred 20-30GB of files to it no problem. I could see the files afterwards and managed to run (play) music files from it. If I'd had this drive first the rating would have been a 5.
So in short, Western Digital don't seem to have their support act together, some of their products appear to have faults, but hey, it's cheap, and it's easy to return stuff to Amazon and get a replacement!