Seagate ST9146802SS, ST973402SS manual Savvio 10K.2 SAS Product Manual, Rev. B

When prefetch (read look-ahead) is enabled (enabled by DRA = 0), the drive enables prefetch of contiguous blocks from the disc when it senses that a prefetch hit will likely occur. The drive disables prefetch when it decides that a prefetch hit is not likely to occur.

Savvio 10K.2 SAS Product Manual, Rev. B 15