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Hi, zorxd. What you want to do isn't possible using the Intel(R) Matrix Storage Manager. Disks are pulled into an array, there's no way to pull portions of disks. If you wanted to create RAID 1 using both of those disks, you'd lose the remaining 750GB on the 1TB disk. You always want to use disks of equal or similar sizes for RAID to avoid the problem of unusable capacity.