Adaptec RAID 2810SA Software Reference Manual page 202

The R/W Column
The R/W column displays whether the partition is read-only or
read-write. Specifically, the column can display the values listed in
Table 7-5.
Table 7-5. R/W Array Values
Value Meaning
RO The partition is read-only.
RW The partition is read-write.
disk Commands
7-18