Slow Read/Write With SSD

[Shakin_Handz]

So I just purchased a Patriot Pyro 120GB Sata III SSD and was getting funky results with BlackMagic Disc (150 write/200 read) which is way off when this drive is supposed to get 500+MB/s. Doing some searching I found very little on how to fix this. Trim is enabled, and quite honestly it seemed that my speeds were pretty fast.

I found better testing results with Terminal commands..

Found the popular: time mkfile 4g ~/Downloads/test

And was getting around 400 MB/s with that. I found a new one I wanted to share here for those who were having issues. Again there was not much info on a fix, other than blackmagic doesn't test well with Sandforce. With these commands I resulted in 479/415 write read...

Write
time dd if=/dev/zero of=testfile bs=4k count=4194304
Read
time dd if=testfile of=/dev/null bs=4k count=4194304

Give it shot

 

[bcarlzson]

Thanks, I was wondering big time about my drive as well,

Carlsons-Mac-Pro:~ carlson$ time dd if=testfile of=/dev/null bs=4k count=41943044194304+0 records in
4194304+0 records out
17179869184 bytes transferred in 42.240213 secs (406718338 bytes/sec)

real 0m42.244s
user 0m0.851s
sys 0m8.685s
Carlsons-Mac-Pro:~ carlson$ time dd if=/dev/zero of=testfile bs=4k count=41943044194304+0 records in
4194304+0 records out
17179869184 bytes transferred in 36.040048 secs (476688298 bytes/sec)

real 0m36.242s
user 0m0.997s
sys 0m25.098s
Carlsons-Mac-Pro:~ carlson$

 

[nukedukem]

I don't recall what max SATA II speeds are, but you may be simply getting the max speeds that a SATA II link can provide. You have to remember that Mac is not capable of SATA III unless you use a PCIe SATA III adapter.

 

[Shakin_Handz]

I have SATA III on my board and I use a SATA III cord. I ended up using AJA and I was having problems with it because my system had the SSD as Read Only. Once I changed that I got ~490MB/s R/W. Pyro 120GB is good to go. Talk about near instant boot time!

 

[Scuba]

The following thread has some communication about Blackmajic and other tests and SSD speeds. I think the Pyro drive uses Asynchronous NAND and the Patriot Wildfire uses Synchronous NAND.

viewtopic.php?f=169&t=47473&start=10