FM Recorder: New hard drive recognition problem

[dyldog]

I have just replaced my fm recorder's hard drive with a clean, FAT32 formatted 30 GB drive.  The new drive boots fine in Rockbox (I have a late daily build flashed), I can see files and play them, etc.   However, when I try to connect to my computer, the computer doesnt recognize the disk (recoder shows usb picture on screen though).  When I take the disk out and use a usb case the new drive is recognized fine, and also when I put my old disk back in the recoder it works fine.  Does anyone know what is going on here?  Thanks...