This is going to sound stupid, but it has worked for me in a crunch.

I had a 1st generation Zune 30GB hard drive start making the clicking sound while trying to load a song. It was a sign of a hard drive failure. After searching the net for some kind of life line so that I could get the contents of the drive off, it seems that placing a hard drive or device that uses a hard drive in a freezer for about an hour can let the drive function again for some time until it is inoperable again. I tried it and it worked for me, I was able to copy the songs from the Zune onto my desktop. The Zune actually worked for about a week after that before failing again. No damage was done to the other components of the Zune in the freezing process but you mileage may vary!

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)