Seagate ST3250312CS, ST3250412CS manual IDLE IMMEDIATE command with IUNLOAD faeture is supported

13	IDLE IMMEDIATE command with IUNLOAD faeture is supported.
14	Shall be set to 1.
15	Shall be cleared to 0.
Bit	Word 88
0	Ultra DMA mode 0 is supported.
1	Ultra DMA mode 1 is supported.
2	Ultra DMA mode 2 is supported.
3	Ultra DMA mode 3 is supported.
4	Ultra DMA mode 4 is supported.
5	Ultra DMA mode 5 is supported.
6	Ultra DMA mode 6 is supported.
8	Ultra DMA mode 0 is currently active.
9	Ultra DMA mode 1 is currently active.
10	Ultra DMA mode 2 is currently active.
11	Ultra DMA mode 3 is currently active.
12	Ultra DMA mode 4 is currently active.
13	Ultra DMA mode 5 is currently active.
14	Ultra DMA mode 6 is currently active.

32 Pipeline HD.2 Series SATA Product Manual, Rev. E