I need a new hard drive for my laptop, and I have an old thinkpad t20. it says on the ibm site that ata 5 hard drives will work with it, but searching around online I notice that most laptop hdd's are ata 6. would I be able to put an ata 6 hard drive in my laptop, even though it says ata 5 on the ibm site? much thanks for any help/insight.