i was banned from xbox live with my 120 gig hdd....so i figured i would just reinstall my stock xbox hard drive since i never even used it on live....well when i swap the hdd i get the error code 6....now i know thats because the existing eeprom on the xbox cant unlock the stock hdd.... i dont have the original epprom for the stock hdd...is the stock hdd now completely useless....i wanted to make an external hdd case so that that i can swap between the 2 but would this even work since everytime i swap the 120 hdd for the stock one i will get the error 6 message...unless u used the same eeprom in both....anyway any help would be greatly appreciated....

Yep, it's a paperweight unless you have the eeprom code that the stock drive was locked to.