Before you ditch the old HDD (from the SEA ANCHOR) and when you get the new unit, plug in the external drive and make sure that what you have transferred reads on the new system. You didn't mention what operating system you had on the old puter, assume Win XP in that event you should be o.k. Most do not feel that storage on an external HDD, for critical data, personal stuff etc. is adequate, glitches do occur on external drives. So what to do, well when you get everything hooked up to the new system you can transfer the data from ext drive to new system, usually to doc files, from there burn to CD or DVD for a hard copy.When all is done then you can mash the old HDD but don't do that before you complete transfers. Good luck!