Windows 7: SDHC reader issues

First, I'm not looking for help with my tablet problem, but this preface is to provide background information. I'd seen many USB card readers advertised, and I ordered the SanDisk MicroMate (a SDHC device), thinking I could connect this to my android tablet and quickly have additional (using a new 8GB SDHC card) storage for reading and writing. When the connection was made, however, the message was "Blank USB storage; USB storage blank or has unsupported format" I offer this to indicate that the reader does seem operational. The card couldn't be accessed using the tab's file managers.



In an attempt to figure out the problem, I tried using it on my two Windows PCs (both Win 7-64b computers, a desktop and a laptop) and found what are to me confusing results:


1. If I insert the new 8 GB SDHC card into the internal card reader of either of my computers, it is immediately accessible. I was able to copy a file to it. Format is FAT32.

2. If I connect the reader to a powered USB port on either computer, the reader device is shown with no errors in Device Manager, but when the card is inserted into the reader, the error "the drive must be formatted" appears.

Thanks in advance for any insights!

If you have no needed files on the sdhc format it with SD Formatter & see how that goes. Download link is on the left.