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Can I use a data SATA 3 HDD in a SATA 2 and then add that HDD to a New Computer?

I have a 640 GB HDD in a 4 year old HP that only accepts 3GB/s. I need more space and I also know a new computer is coming at some point. My boot drive is a 120GB Intel X-25 SSD. The current HDD was the HDD that came with the computer, is still bootable under Windows 7 and I have image backups of the partitions which I would use to transfer the old to the new.

So, if I get a SATA 3 drive that will normally run 6GB/s with 2 TB of memory, would I be able to slap it into whatever new machine I get if I get a 256 GB or 512 GB SSD as the only drive at purchase and then add the proposed drive and have it run at 6GB/s?

Thanks for any responses.
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  1. Best answer
    as long as the motherboard has sata3 ports it should be fine , even so if it only has sata2 still going to work just not as fast as it could
  2. tassietim said:
    as long as the motherboard has sata3 ports it should be fine , even so if it only has sata2 still going to work just not as fast as it could


    As long as the new computers motherboard had SATA 3 support that will run at 6 GB/s it should be fine?

    Thanks for the reply.
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