Slow sequential writes/read for Crucial M4 128gb

So I finally got off my a$$ and installed my SSD, moving my HDD to the ODD. While it is pretty darn quick in comparison, the sequential speeds aren't quite there for some reason. It almost looks like a SATA II cap, but I verified it was a SATA III connector.

This is a MBP 15 2011. I applied JJB tweaks for the Windows CDM test.








Will edit with Crystaldisk.

 

so, Fresh install, or clone from HDD? did you format and partition it first, then install everything, or did you format, install, shrink the partitions, and create a new one?
I saw that with my Crucial M4 64GB that it was mis-aligned because I installed XP, then shrunk the partition, then installed Win 7 (not sure it it was caused by that, or it was a bad install of both or something else, but the drive was mis-aligned and not running at full speed)

I think the program/ benchmark "AsSSD" can tell you if it is aligned properly or not.

 

Fresh install, formatted drive then partitioned (albeit through Mac first), then reformatted bootcamp parition then fresh install Win 7.

AsSSD is giving me the same speeds. Access times are 0.15/0.21. But on the side, it does say "pciide - BAD" though, so I guess I messed up? Any way to correct it?

EDIT: It seems aligned though:



Must be... the damn Mac support thing. Does anyone know how to enable AHCI, or if Macs even support it?

 

A for sure way is to back it up and use Diskpart to clean it and realign it and than restore.

Please see a thread on refreshing the M4 in the Crucial forum that gives you the detailed instructions. Now that I have said all that I don't have a clue as to whether any of that works on a Mac. Sorry wrong world for me.

 

The alignment is fine. I'm getting decent speeds in Mac's own disk checker.

But Bootcamp boots IDE, which is a pretty hefty performance drop. Oh well.