Found this on the PCMIA cards. This might have been my problem back in the day since we never had the correct serial cable to issue receiver commands to any of the GSR2300s, just the 2200.
Formatting the PC Card
PCMCIA cards are typically factory formatted for PC compatibility. If the PC card is not formatted, format it with the PCMCIA drive in the PC using the DOS format command.
Prior to use in the receiver, the PCMCIA card must also be receiver formatted, and should be reformatted on a regular basis. PC cards should be reformatted biweekly for receivers in continual use. Regular reformatting prevents file fragmentation on the card that could cause data problems.
The PCMCIA card can be formatted in one of the following two methods.
However, prior to first use, the $PASHS,CLM method should always be used.
• Issue the serial command $PASHS,CLM which formats all tracks in the PC card one by one, including the FAT (file allocation table), the directory, and the data area. This process requires approximately 7-8 seconds per MB, including both the reformatting and the file system mounting time.
This is the optimum and recommended method.
• Issue the serial command $PASHS,FIL,D,999 or select the DELETE ALL option in the SESSION menu on the front panel LED display. Both of these techniques format only the FAT and the directory area in the PC card, and does not physically clear the data area. This process takes just a few seconds to complete, regardless of PC card size.