Seagate BARRACUDA 9 ST19171WD - Manual (Page 21)

Barracuda 9 Installation Guide, Rev. B 19
11 No terminator power. See 11.7.3.4 in the Barracuda 9 Product
Manual.
12 All power-saving features are enabled; ASA II code only.
13 Seeking is defined as a third-stroke seek at OD. The command
is issued every 20 msec.
14 Read track is defined as repeat reads of track 15 with a duty
cycle of: 78% for N drives, 32% for W drives, 48% for WC
drives, 44% for WD drives, and 44% for DC drives.