SSD Aging: Read Speed is Largely Unaffected

Given the nature of the SSD performance-over-time “problem” you’d expect to only pay the performance penalty when writing files, not reading. And for once, I don’t have any weird exceptions to talk about - this is generally the case.

The table below shows sequential read performance for 2MB blocks on new vs. “used” SSDs. I even included data for a couple of the hard drives in the "Used" column; for those numbers I'm simply measuring transfer rates from the slowest parts of the platter:

2MB Sequential Read Speed New "Used"
Intel X25-E   240.1 MB/s
Intel X25-M 264.1 MB/s 230.2 MB/s
JMicron JMF602B MLC 134.7 MB/s 134.7 MB/s
JMicron JMF602Bx2 MLC 164.1 MB/s 164.1 MB/s
OCZ Summit 248.6 MB/s 208.6 MB/s
OCZ Vertex 257.8 MB/s 250.1 MB/s
Samsung SLC   101.4 MB/s
Seagate Momentus 5400.6 77.9 MB/s -
Western Digital Caviar SE16 104.6 MB/s 54.3 MB/s
Western Digital VelociRaptor 118.0 MB/s 79.2 MB/s

 

The best SSDs still transfer data at over 2x the rate of the VelociRaptor.

Read latency is also extremely good on these worn SSDs:

I left the conventional hard drives out of the chart simply because they completely screw up the scale. The VelociRaptor has a latency of 7.2ms in this iometer test with a queue depth of 3 IOs; that's an order of magnitude slower than the slowest SSD here.

Since you only pay the overhead penalty when you go to write to a previously-written block, the performance degradation only really occurs when you’re writing - not when you’re reading.

Now your OS is always writing to your drive, and that’s why we see a performance impact even if you’re just launching applications and opening files and such, but the penalty is much less tangible when it comes to read performance.

New vs Used SSD Performance The Verdict
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  • Slash3 - Wednesday, March 18, 2009 - link

    Page 29: "Not all applications will launch faster than a VelociRaptor on a SSD, but let's not forget that the VelociRaptor is the world's fastest hard drive."

    Really? What about the nice and speedy enterprise-level 15k SAS/SCSI drives everyone neglects to acknowledge? :)
    Reply
  • George Powell - Wednesday, March 18, 2009 - link

    I believe it refers to consumer drives. While SAS drives are beginning to be a possibility on the desktop with newer motherboards supporting them natively, the drives themselves are too expensive and too noisy for most consumers to actually want them.


    Reply
  • FishTankX - Wednesday, March 18, 2009 - link

    Good info. However, I noticed one mistake.

    Second page
    Samsung had a MLC controller at the time but it was too expensive than what SuperTalent was shooting for.
    Reply
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  • matrixireland - Thursday, December 24, 2009 - link

    hi would like to know what you pros think of the;
    Golden Leopard ASAX-ZIF1.8-SSD? what would you add to it?
    And how would you rate it against other ssd?

    Specifications:

    product description

    ASAX-ZIF1.8-SSD is a high-performance design solid state drive based on the high-end micro-control IC with flash memory storage medium integrated advantaged of high speed,convenient ,aseismatic,energy-saving etc.


    specification

    Model

    Size

    Interface

    Material
    ASAX-ZIF1.8-SSD

    1.8inch 70×54×6mm

    ZIF
    Aluminum-magnesium alloy appearance ,drawbench and colorful oxidation surface,elegant temperament


    performance
    read speed:80- 96Mbytes/second write speed:50- 60Mbytes/second
    support ATA-7 V3 PIO/multi word/ultra DMA MODES
    Low power TFBGA,4 channel of flash controller,masked ROM and data SRAM
    SAMSUNG flash keeps the data faster on reliability and endurance
    Dynamic and static wear-leveling prolong NAND FLASH and SSD for longer life
    8/16 bit BCH ECC data error correction ability effectively guarantee the data read security.

    Design consideration

    Capacity

    16G/32G/64G/128G/256G
    Average access time

    <0.25MS
    operating temperature

    0-85°
    power consumption

    DC Input Voltage(3.3V or 5 V ± 10%)Read and write:135mA/194Ma wait:70mA
    shock

    1500G


    Application
    the Laptop, pc, server,workstation,portable media player,digital collection apparatus and any computer equipment which need consecutive read and write speed and high reliability storage.
    Reply
  • jay401 - Wednesday, March 18, 2009 - link

    yeah, he wants "more expensive than" or "too expensive for". Reply
  • Spoelie - Wednesday, March 18, 2009 - link

    Second page as well:

    missing charts before and after this paragraph:

    "The chart above shows how much faster these affordable MLC SSDs were than the fastest 3.5” hard drive in sequential transfers. But now look at random write performance:"
    Reply
  • Spoelie - Wednesday, March 18, 2009 - link

    chart 1 on page 2 now shows sequential read but the paragraph is changed to mention random read ;)

    page 21: As far as I know, this is THE one of THE only reviews

    Some very surprising benchmark results for the ocz vertex, I thought the new firmware tanked sequential read speeds (to 80-90) based on the explanation beforehand, but not according to the actual graphs.
    Reply
  • Spoelie - Wednesday, March 18, 2009 - link

    third page, first table, first column: SSD and HDD entries are switched Reply
  • mikaela - Tuesday, March 16, 2010 - link

    yeah great info. also great resource Reply

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