Batboard

I've got a 4GB micro SD card by PNY. I used it recently to update my Garmin GPS and somehow, the darned thing got re-partitioned to a 64MB only by the Garmin software. There's a whole bunch of space on the disk that I can not access. I tried using the Disk Management tools in Win 7 to manipulate the partition, but all of those functions are grayed-out and unusable.

All of the help I find with a google search just points me back at the Disk Management tools.

Can anyone offer a better solution? I'd hate to write off this card.

Thanks in advance.

If you have a Linux Live CD, boot from it, and use the dd command to wipe the partition table.

(if you need detailed instructions on how to do this, DON'T: there's a reason people refer to 'dd' as 'destroy disk').

I found on PNY's website a low level format utility, but it appears to be for something else. They might have some sort of utility on their website somewhere, but I am not finding one. I would think the disk managment utilities within windows would normally be able to take care of it.

Is there any sort of option when the card is in your GPS to format the card there? Maybe it can get back the lost space? It's a long shot though.

Thanks to all for the suggestions. I spent more time searching about the net and finally found exactly the right tools in a program called MiniTool Partion Wizard Home Edition. It was a free download off CNet. It repaired the card almost instantly. (Whew!)