I have a SiI3112 rev 2 and a Toshiba MK2561GSYN HDD. I think it
belongs in the list of buggy drives which require Mod15Write.
To test, I perform:
dd if=/dev/zero of=/dev/sdb oflag=direct bs=8192
Without enabling slow_down, after moment of pause, this shows up in dmesg:
ata7.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata7.00: failed command: WRITE DMA
ata7.00: cmd ca/00:10:80:01:00/00:00:00:00:00/e0 tag 0 dma 8192 out
res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
ata7.00: status: { DRDY }
ata7: hard resetting link
ata7: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
ata7.00: configured for UDMA/100
ata7.00: device reported invalid CHS sector 0
ata7: EH complete
If I use slow_down, these timeouts are gone completely. If I write
7680 (15 sector), repeated 100000 times, it is okay. Reading any size
is okay. All of my other drives behave with this card.
My HDD is HP part 625239, firmware is MH000C. I do know whether other
models (in the series) or firmwares have this problem.
The following drives are in series TOSHIBA MKxx61GSYN:
MK1661GSYN MK2561GSYN MK3261GSYN MK5061GSYN MK6461GSYN
I searched for pictures on the Web, and found that these models used by
Dell have firmware MH000D, and some others have firmware MH000A (maybe
these are retail).
MKxx61GSYN listed as current, not discontinued, at Toshiba's Web site.
http://storage.toshiba.com/storagesolutions/pc-notebook/mkxx61gsyn-series
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