Does the automatic trim really work ?

[OPLIC]

Two weeks ago I have successfully updated the firmware of my brand new Intel X25 G2 80GB (to 02HA). I set the ICH9R to AHCI and then installed my brand new Windows 7 OS. I have checked that my ssd was using the MS AHCI driver. So according to Intel, everything was ok to make automatic trim work : 02HA firmware + MS ACHI driver + windows 7.

Two weeks after, all my softwares were installed on my ssd (10 GB are free now). I launched Crystal diskmark and I had only 30 MB/s for the "4k write". All the other tests ( 512 k read/write, sequential read/write and 4k read) were also a bit disappointed (but fortunately not as much as the 4k write).

So I launched the Intel SSD toolbox and ran the ssd optimizer (manual trim). And yes, after that, my ssd is like brand new : 70 MB for the 4k write... (the other values are also higher).

So, does the automatic trim really do its job ? How can I check that it is really active ?

[idata]

Here: http://en.wikipedia.org/wiki/Serial_ATA http://en.wikipedia.org/wiki/Serial_ATA

We can read that:

"There are at least four bodies with possible responsibility for providing SATA specifications: the trade organisation, /wiki/SATA-IO SATA-IO; the /wiki/INCITS INCITS /wiki/T10 T10 subcommittee (/wiki/SCSI SCSI); a subgroup of T10 responsible for /wiki/Serial_Attached_SCSI SAS; and the INCITS /wiki/T13 T13 subcommittee (/wiki/ATA ATA). This has caused confusion as the ATA/ATAPI-7 specification from T13 incorporated an early, incomplete SATA rev. 1 specification from SATA-IO./# cite_note-3 [4] The remainder of this article will try to use the terminology and specifications of SATA-IO."

[idata]

HD Tune reports Active UDMA 7 (Ultra ATA/512) Suported is UDMA 6 (Ultra ATA/133)

My question is Active UDMA 7 (Ultra ATA/512) appears to be a PATA mode? Why Supported UDMA 6 and Active UDMA 7?

[idata]

Maybe HDtune reports are wrong ?

It also says the drive is in ATA/ATAPI-0 (zero).

The drive works at SATA/300 and we can see it in benchmarks.

Those UDMA levels can be reported for IDE mode compatibility with older software.

From intel x-25m g2 datasheet:

http://download.intel.com/design/flash/nand/mainstream/322296.pdf http://download.intel.com/design/flash/nand/mainstream/322296.pdf

x-25m g2 is: ATA/ATAPI-7 Compliant.

From T13 volume 2 - Anexe E:

http://www.t10.org/t13/project/d1532v2r4a-ATA-ATAPI-7.pdf http://www.t10.org/t13/project/d1532v2r4a-ATA-ATAPI-7.pdf

Quote: "Ultra DMA modes 0, 1, 2, 3, 4, and 5 have maximum transfer rates of 16.7, 25, 33.3, 44.4, 66.7, 100 and 133 MB/s, respectively."

So the official standard document for atapi/7 has a typo in page 190 and only goes upto UDMA5?

We know that UDMA6 is 133MB/s and ATAPI-7 goes up to UDMA6, so I give up.

I would also like to know what is UDMA7 ?

[idata]

I believe UDMA 7 is PATA. I think HD Tune is just reporting it all wrong.

[idata]

so... if i want to use win7 automatic trim i mustn't install neither intel matrix drivers nor inf update utility right?