Switching eeproms .... you need to back up the eeprom with a program like evox . Then you take that file and load it up on your computer . Then you need to unlock both of those drives then relock them with the other's eeproms then the HD will work in the other xbox and vice versa .
1.Both Xbox's need to be modded in some manner (softmod reccomended as it is easily reversable and costs nothing )
2.Back up eeprom using an app (evox reccomended)
3. Use a locking unlocking tool to relock the drives with eeprom of your choice . ( I use xboxhdm
A eeprom is a form of protection for hard drives . It makes it so a hard drive can be used on only a piece of hardware with the proper password on it ( kinda)
An EEPROM (E²PROM), or Electrically-Erasable Programmable Read-Only Memory, is a non-volatile storage chip used in computers and other devices. Unlike an EPROM, an EEPROM can be programmed and erased multiple times electrically. Each bit is set by quantum tunneling electrons across a thin dielectric barrier. Because of this. it may be erased and reprogrammed only a certain number of times. Write/erase cycle lifetimes range from 100,000 to 10,000,000, but an EEPROM can be read from an unlimited number of times. Flash memory is a later form of EEPROM. In the industry, there is a convention to reserve the term EEPROM to byte-wise writable memories compared to block-wise writable flash memories. EEPROM takes more die area than flash memory for the same capacity because each cell usually needs both a read and a write transistor where flash memory needs only one.So if you are just trying to get saves from one box to the other switching hard drives is probally the worst idea . You need to Softmod both boxes and ftp his saves over .
If you don't unserstand this spend some time in the TUTS