Seagate ST9750420AS Momentus 7200 FDE.1 SATA Product Manual - Page 46
Table 10, Set Features command values
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Table 10: Set Features command values 02H Enable write cache (default). 03H Set transfer mode (based on value in Sector Count register). Sector Count register values: 00H Set PIO mode to default (PIO mode 2). 01H Set PIO mode to default and disable IORDY (PIO mode 2). 08H PIO mode 0 09H PIO mode 1 0AH PIO mode 2 0BH PIO mode 3 0CH PIO mode 4 (default) 20H Multiword DMA mode 0 21H Multiword DMA mode 1 22H Multiword DMA mode 2 40H Ultra DMA mode 0 41H Ultra DMA mode 1 42H Ultra DMA mode 2 43H Ultra DMA mode 3 44H Ultra DMA mode 4 45H Ultra DMA mode 5 46H Ultra DMA mode 6 55H Disable read look-ahead (read cache) feature. 82H Disable write cache AAH Enable read look-ahead (read cache) feature (default). F1H Report full capacity available Note. At power-on, or after a hardware or software reset, the default values of the features are as indicated above. 40 Momentus 7200 FDE.1 SATA Product Manual, Rev. B