here is an updated hdparm

hdparm -t /dev/sda
*-----------------------------------------------------------------------------*


/dev/sda:
Timing buffered disk reads: 58 MB in 3.03 seconds = 19.16 MB/sec

*-----------------------------------------------------------------------------*


hdparm -t /dev/sdb
*-----------------------------------------------------------------------------*


/dev/sdb:
Timing buffered disk reads: 492 MB in 3.00 seconds = 163.82 MB/sec

*-----------------------------------------------------------------------------*


hdparm -t /dev/sdc
*-----------------------------------------------------------------------------*


/dev/sdc:
Timing buffered disk reads: 304 MB in 3.01 seconds = 101.09 MB/sec

*-----------------------------------------------------------------------------*


hdparm -t /dev/sdd
*-----------------------------------------------------------------------------*


/dev/sdd:
Timing buffered disk reads: 264 MB in 3.00 seconds = 87.86 MB/sec

*