Has something to do with the flash memory. If they boot computer and tell it to ignore flash memory it appears to work normally. They also said it appears to be something wrong with the file structure on the flash memory. They will try to download data from the flash tomorrow to learn more.

If I remember correctly... here are the amounts of memory Spirit has

RAM = 128 MB
FLASH = 256 MB
EEPROM = 3 MB

The FLASH and EEPROM remember data after the power is turned off, ram doesn't.

They don't know yet... it could just be a corrupted file structure or it could be problems with portions of the memory. Either way, it is very likely they will be able to work around this problem and eventually get on with this mission.

Good luck to Opportunity tonight!