Yes, OEM is the same physical disk with a different label (as far as I can tell). The license is just different. You might want to check, but according to my company's agreement, a hard disk alone does not fulfill the OEM license agreement. A mobo would or a processor might (still not sure and MS will not give us a definitive answer), or a lan card may as well. M$ is just vague enough on the agreement so those items are in doubt, but not specifically called out. The OEM agreement _used_ to indicate that the software could only be provided with a minimum of parts (mobo, case, memory and cpu). The license has changed over the years and it makes my head hurt to try and figure it out (the way M$ likes it), so this may have changed drastically.