Upsizing an external hd

hi all. have a lacie 250gb ext hd, model 300790U. hard drves have come along way since i bought this thing and i want to upragde. i cant find any info on doing this. is it possible? whats the largest size i can go up to? i see a seagate 750gb drive ultra ata100, will this work? any info will be appreciated

If your PC is IDE an IDE external will work…If PC runs SATA then a Sata will work…Buy two 500GB…or one.