Adaptec 48300 - Manual (Page 93)

Understanding RAID ●
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RAID 10
A RAID 10 array is built from two or more equal-sized RAID 1 arrays.
Adaptec HostRAID controllers support a maximum number of four
disk drives in a RAID 10 array and two spare drives.
Data in a RAID 10 array is both striped and mirrored. Mirroring
provides data protection, and striping improves performance.
Drive segment size is limited to the size of the smallest disk drive in the
array. For instance, an array with two 250 GB disk drives and two 400
GB disk drives can create two mirrored drive segments of 250 GB, for a
total of 500 GB for the array, as shown below.