Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Recently I've noticed that my SSD, which is a Crucial model CT128V4SSD2, is performing really really poorly. I took a benchmark test and here's the result:

enter image description here

In addition, I noticed from the Task Manager dialog in Windows 8 that the response time of the drive is very long.

enter image description here

Is my SSD having serious problems? Is there a way to identify what's causing the slowness?

share|improve this question
the benchmark images don't load for me, could you use the "upload" picture button to host them properly? – Ben Brocka Nov 3 '12 at 20:06
Sorry, didn't know there's an upload picture button. Thanks for editing the question. – superkinhluan Nov 3 '12 at 20:09
No I didn't notice any slowness before. The only thing I change recently is installing a new graphics card. – superkinhluan Nov 3 '12 at 20:11
How full is the drive? Is TRIM enabled? See here for info on how to check that. – Indrek Nov 3 '12 at 20:20
The drive still has 81 GB free out of 120GB. TRIM is enabled. – superkinhluan Nov 3 '12 at 20:24
up vote 0 down vote accepted

Look at the picture. Is tells you that you run the SSD in IDE mode (PCIIDE) instead of AHCI (MSHACI/AMD_sata). So go into the BIOS and change the mode to AHCI.

Attention, enable the AHCI drivers first or you'll get the 0x7B STOP code "INACCESSABLE_BOOT_DEVICE".

The key is renamed in Windows 8 to StorAHCI instead of Msahci, the rest is the same.

share|improve this answer
Thanks for the response. Does it mean for SSD, I have to use AHCI mode? I didn't know this. – superkinhluan Nov 24 '12 at 16:01
always run all HDDs in AHCI mode. This improves performance a lot. – magicandre1981 Nov 24 '12 at 18:16
I've just checked my BIOS, and it has only the RAID mode. There's no AHCI mode. will RAID mode help? – superkinhluan Nov 24 '12 at 18:18
which motherboard do you use? – magicandre1981 Nov 24 '12 at 18:19
It's the default motherboard that comes with Dell Studio 540: IPIEL-RN2 Motherboard – superkinhluan Nov 24 '12 at 19:14

According to the specs for your drive:

Newegg Product Description
Max Sequential Read
Up to 230 MB/s
Max Sequential Write
Up to 175 MB/s
4KB Random Read
Up to 10,000 IOPS
4KB Random Write
Up to 4,000 IOPS
1,200,000 hours

That suggests that your read is about there, the write is a bit slow (but you aren't doing sequential in some of those tests - so not alarming).

The seek time is pretty questionable though. Might be a sign that it was formatted poorly, oddly enough. SSD's are a bit more particular about that (the best tool I have read of/used is Parted).

share|improve this answer
Sequential writes are pretty slow, 76 MB/s vs. 175 MB/s in the specs. 4K reads and writes are also rather slow. Specs give 39 MB/s for reads and 15.6 MB/s for writes, but OP's drive gets 16 MB/s and 3.8 MB/s respectively. – Indrek Nov 3 '12 at 20:17
Are you suggesting I'm using Parted to reformat my drive? – superkinhluan Nov 3 '12 at 20:17
@Indrek, what is OP's drive? – superkinhluan Nov 3 '12 at 20:19
Original Poster's (SSD)drive. – page4096 Nov 3 '12 at 20:20
@superkinhluan "OP" means "original poster", so in this case, you. I'm referring to the benchmark results you posted in your question. – Indrek Nov 3 '12 at 20:21

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.