You hardware has to support RAID technology, read the manual for your motherboard. If you have Linux you can have software RAID which is slower than hardware but still can be used to for mirroring, striping and so on. In the manual should described how to create RIAD (0, 1 and so on).
You can have RAID software for windows too, but it's expensive and perfomance is not that great.
RAID 10
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A group of hard drives assembled into a RAID array is often referred to as, well, a "RAID array" a "RAID stack" or a "RAID cluster."
Every RAID level stripes data across multiple drives, which improves performance compared to using a single disk. RAID 0, RAID 1, RAID 1+0, RAID 5, RAID 6, etc. all have better performance than a single disk. Other than RAID 0, all other RAID levels provide fault tolerance. RAID 1, RAID 1+0, RAID 5, RAID 6, etc. all have fault tolerance.
RAID stands for a redundant array of independent disks. Thus, a group of two or more hard disks comprise a RAID, or array of physically separate drives.
The best RAID configuration depends on your specific needs for performance, redundancy, and storage capacity. RAID 1 offers excellent redundancy by mirroring data across two drives, making it ideal for critical data protection. RAID 5 balances performance, redundancy, and efficient storage use by distributing data and parity across three or more drives. For maximum performance with some redundancy, RAID 10 combines the benefits of RAID 0 and RAID 1 but requires a minimum of four drives.
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Raid 1 is mirroring.
It is relatively easy to replace Raid one drive with a larger Raid one drive. You must turn off your system, and take out the drive, and place the larger drive in its place. Next, you turn on the system, and install the larger drive.
Check with your motherboard manual (if it has onboard RAID), or check with your RAID controller's manual to see if it supports setting up single drives and not having a raid configuration.
That is RAID 1. It uses two drives with identical data so if one fails, you have the other drive. One variation of RAID 1 used by certain controllers is to write as RAID 1 but read more like RAID 0 (but without the striping). That way, you have the write protection of a mirrored set, but can use the two drives to do interleaved reads for a read performance boost.
For Raid 5 all the hard drives have to be of the same speed.