Slave?

it is possible. i think the only thing you need to do is make sure that the drive you are adding needs to have its jumper moved to the slave position and make sure the other drive allready in the computer is set to master.

I am presuming the drive you want to re-use is an IDE drive, not SATA, right? Because if it is SATA, there is NO Master or Slave for those drives. If it's really IDE, skip down.

To install a used SATA drive in a new system you simply connect it to an open SATA port and make sure in BIOS Setup that the port is Enabled and is set to the proper mode. If you are using Vista or Win 7 as your OS, the mode should probably be native SATA or AHCI. But if you're using XP in any version, you can go one of two ways. Set the port to use IDE (aka PATA) Emulation and the BIOS will make the SATA drive appear to Win XP to be an IDE drive it fully understands so it can work. But if you want to use either native SATA or AHCI mode for this drive and NOT try to boot from it, you do the hardware install and then install in Win XP the proper driver for that type of hard drive. Reboot to make the changes work.

Now, going back, if this really is an IDE drive anyway, read my post here:

http://www.tomshardware.com/forum/ [...] led-drives

Ensure your IDE port(s) on the mobo are enabled and set the drive's jumpers according to what else you have connected on your IDE port(s) already. Your old drive will be used as just another data storage device. It may be a Slave (ONLY if it is on an IDE port that already has a Master), or it may be the Master of an IDE port. The MACHINE does not have one Master and a bunch of Slaves. Each IDE port has one Master and MAY have one Slave, too.