OMG man, of course my MS slot is ok, if it was broken and there was a error while saving the file to the MS the PSP would display a fatal error(what's up with that - every single error on the PSP is fatal
) since it will think the MS is removed while the data was transferred. I've had such problem with a 2Gb miniSD in a Nokia N80 and when one of the contacts isn't ok the phone says "You should not remove memory card while in use!" or something like that and the corrupted file is then either deleted or with size 0kb. I'll now switch my USB's to 1.1 and will see if it's having such problems again but 1.1 is still too fast imho(when the files are stored correctly the speed is usually about 500kb/s).