Purge Corrupted File HP50G

[buffalo]

Thanks in advance for anyone that can help with this.
i somehow have aquired a very nasty corrupt file on my SD card, which i want to be rid of.
any action i take with it RCL, VIEW, PURGE, MOVE etc causes the calculator to "hang" for what seems an eternity, it does not respond to reset (ON C) i have to invoke the dreaded paperclip
which has cleared memory on many occasions.
Does anyone have a possible solution, to my troubles.

regards buffalo