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If I were building this for myself then I would do neither.
A terabyte of capacity, though it sounds impressive, is like hitting an ant with a hammer. It’s highly unlikely that you would ever need such a huge capacity in anything less than a commercial operation.
Why not get 4 x 300G hard drives for about $70 each, and create a RAID 0+1 array.
RAID0 will use 2 of your drives as one, splitting parts of your info in each drive simultaneously. The bottleneck in any modern PC is the transfer rate of the hard drive.. processors can now work far faster than hard drives, and have to wait continually while files are written to and recovered from the hard drive. By splitting the info into parts and using 2 drives at the same time, transfer rates, particularly for large files such as in video editing, are hugely improved. You are taking advantage of modern processor power to write to both drives at full speed simultaneously. This makes a great improvement in the overall performance of the computer.
RAID1 is mirroring, and as the name implies, it creates a mirror image. As you use your RAID0 array at amazing speeds, it is also written simultaneously to the second pair of drives using RAID1, creating an exact copy. This is your backup! If any one of your 4 drives develops a problem, all info is recoverable from the other set!
Of course, since half of your drives are devoted to backing up the other half, you have now reduced your capacity from 4x300G to 2x300G(x2). Refer to my original point.. 600G is a heck of a lot of storage!! I am using exactly this setup, and I doubt I will ever need more space than I currently have.
If you still wish to partition, you can still do this within the RAID0 array, but as you have a complete backup via RAID1, it becomes un-necessary. If you want a sharing drive, simply share some folders instead.
The end result as you look at your computer, is a single virtual 600G drive that runs at far faster speed than a normal setup would, and which is automatically written as an exact copy to a backup drive instantly.
Of course, if you still think you need more space.. then buy larger drives… just make sure they are all the same model and size to avoid any possible conflicts.
Mitz from Tips4pc