2

My laptop is a Toshiba Satellite L670-1LX, bought in 2011. It originally had a HDD, but a few days ago I bought a Toshiba Q300 SSD drive. I partitioned it (aligning partitions to multiples of 2048 sectors) and cloned the OS (Ubuntu Mate 16.04) from the HDD to the SSD using clonezilla.

The command hdparm -t /dev/sda tests sequential read speed. on my Q300 SSD, its output is 253 MB/s (average value), whereas it could be near 550 MB/s.

  • Could it be because my OS doesn't have the drivers installed to properly support my SATA 3.1 controller? As I mentioned, I did not install Ubuntu to the SSD, I just copied the HDD partition.
  • Otherwise perhaps it's not a software issue and my motherboard controller can't support SATA3 at all?

I don't understand all of it, but here is the output of some commands I found on various web pages:

smartctl -a /dev/sda | grep SATA results in:

SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)

hdparm -iI /dev/sda | grep SATA results in:

Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0

lspci | grep SATA results in:

00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller (rev 05)
  • What do you mean by aligned to cylinders? There are no cylinders on an SSD. You should align partitions at multiples of 1 MiB. – AlexP Feb 16 '17 at 9:56
  • @AlexP Indeed, you are right. I did not "align to cylinders", but I am pretty sure I did the alignment right. I checked it with fdisk -lu /dev/sda where each partition starts at a multiple of 2048. I will edit my question and remove the "cylinder" part. – Georg Feb 16 '17 at 11:06
  • 1
    The data sheet says that sequential read speed is up to 550 MB/sec; translated from commercialese, that phrase means that Toshiba guarantees that even in the most ideal conditions imaginable there is no way for the speed to exceed 550 MB/sec; it does not mean that the actual speed on actual computers will be anywhere near that number. – AlexP Feb 16 '17 at 11:29
  • 2
    @AlexP Yes 550 is a maximum. I did not expect the actual speed to be less than half that maximum, though. – Georg Feb 16 '17 at 12:14
0

Your performance test results are better than what CNET got. (In their tests, Toshiba SSD Q300 was measured at 203 MB/sec read, 187 MB/sec combined read/write). The conclusion of the CNET test was that the Q300 was "slow and expensive".

To be fair, Anandtech measured much better performance, but complained of low steady-state performance and poor performance consistency. Anyway, the conclusion was similar: "the Q300 is a low-end drive and is among the slowest SSDs on the market".

  • Good point. Anandtech found 433 MB/sec for sequential read: I am puzzled by the gap between those test results. – Georg Feb 16 '17 at 13:27

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

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