Threats and tantrums are not your best option. This is a user forum. Unfortunately, when SanDisk moved the forum it broke some of the older links.
90MB could be an over-full unit.
However, it can also mean a corrupt file. You can try to remove that file surgically or you can nuke the whole unit.
For surgery, try connecting to the computer and deleting MTABLE.SYS, which is the index. When you delete it the Fuze will rebuild it from scratch.
Don’t see it or can’t connect? Force the connection. Open Windows Explorer (Computer or My Computer), connect the USB to the computer. With the Fuze off, put it on Hold (slide the power button down to click into place and show an orange dot), hold down the << side of the wheel and connect.
If you still can’t see Mtable.sys you may have to tell windows to un-hide hidden folders–look in your Help file on your computer for directions on doing that.
Another surgical possibility: Right-click on the Fuze drive in Windows Explorer. Properties/Tools/Error-checking. Run it, and if it asks to save bad chains, say no. That might fix a corrupt file, too.
Still no joy? Go nuclear. Right-click and Format the drive (to FAT32) from Windows. That will erase all content you have added. Don’t worry, the Fuze operating system files won’t be touched.
By the way, if you put “free 90MB” into that search box up there you would have found something like this:
