SD Card trouble :(

[mmpob]

I bought a Datawrite 1gb sd card to use with my Garmin C510 GPS - I put it in and it asked if I wanted to format. Clicking yes, it went through the motions but right at the end it bailed saying it was unable to complete the format.

Next I tried my 23-in-1 card reader, still the exact same.

Then I stuck it in my Nikon Coolpix 4600. It also wanted to format the card, but completed sucessfully. I took some photos, and that worked ok.

I put the card back into the Garmin, it asks if I want to format.
I put the card into the reader, it can see the photos, but the card is permanently write protected (yes I checked the wee tab)
I hooked the camera up via usb, all working normal

Any ideas what's going on?!?

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