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With the prices so high I'd like to buy only one hard drive first and wait for the prices to go down.

Can I fit only one hard drive?

Furthermore, do two drives have to be the same capacity when I buy the second hard drive?

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The answers to both those questions depend on precisely which model of NAS you buy. Also, as you've tagged this as backup, storing backups on a non-raided disk might seem economical, but it will turn out to be a false economy in the end – RobM Dec 27 '11 at 8:23

closed as too localized by RobM, Ward, Antoine Benkemoun, splattne♦ Dec 27 '11 at 10:48

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Usually, yes. The HDD that you'll add later does not need to be the same capacity. If you have one 1.5 TB, then add a new 2 TB, you can have (a 3.5 TB JBOD) or (a 1.5 TB RAID1 + 0.5 TB) or (a 3 TB RAID0 + 0.5 TB) partitions, in all these cases you need to format both disks. Or just simple plug the second and live with a 1.5 TB + a 2 TB without losing your data on the first one.

Any NAS I know supports that.

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