Hello, what is your SUP/IOS versions?
Basically PCMCIA card should be on dosk/slot. You can check where it is if plugged in by "show file system". It will show you all storages within your sup/standby. Those designated by disk# or slot# is the COMPACT flash drives. Bootflash or sup-bootflash are the disks installed on the MSFC?SUP physically.
Hope this helps,
Nik
HTH,
Niko