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SD Express combines PCIe and NVMe for nearly 1GB/s transfer rates

By Greg S ยท 8 replies
Jun 27, 2018
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  1. The SD Association has announced the introduction of SD Express. Changes allow for PCIe and NVMe interfaces to be used on the legacy SD interface offering up to 985 MB/s of throughput on the new SD 7.0 specification.

    Previously, SD cards were limited to 2TB with SDXC but will now be able to scale all the way up to 128TB using SD Ultra Capacity (SDUC) cards. The microSD form factor will also receive SD Express. Even though the technology may not be ready to put all that storage into a standard form SD card today, this removes one of the barriers.

    Offering such high throughput puts SD cards in competition with SATA solid state drives. Even though speeds may be similar, both have hardware arranged quite differently. SD cards require a host controller be present on any device that has a slot to insert a card. SSDs have an integrated controller that handles all file management operations and communicates with a system. Full backwards compatibility remains in place for devices that cannot make use of the newer standards.

    As data created from IoT applications, increasingly higher resolution cameras and other devices continue to take up more space, the need for more efficient high capacity storage is clear.

    SD Express will be available on SDUC, SDXC and SDHC memory cards. However, the majority of users that truly need the capabilities offered by the new standard are likely going to want to opt for SDUC cards with as much storage as they can justify purchasing.

    Permalink to story.

  2. Theinsanegamer

    Theinsanegamer TS Evangelist Posts: 1,547   +1,767

    This is really neat, it could make for even smaller PCs with tiny storage solutions.

    How are they going to cool it though? M.2 NVMe drives have a lot of heat problems and throttling issues, something the size of an SD card is going to be even harder to cool.
  3. MilwaukeeMike

    MilwaukeeMike TS Evangelist Posts: 3,160   +1,413

    128TB?!!! That's insane! I know it's not real yet, but wow! Makes you realize how ridiculous it is to pay $100 for 32GB in your phone.
  4. BadThad

    BadThad TS Booster Posts: 181   +91

    This is GOOD news!
    DaveBG likes this.
  5. TheBigT42

    TheBigT42 TS Maniac Posts: 321   +220

    What about long term re-writes? I thought I read somewhere that SD cards have a lower MTBF than ssds
  6. ShadowDeath

    ShadowDeath TS Booster Posts: 115   +48

    I feel like the introduction of this stuff will be just like the USB 3 thumb drive markets. Full of bogus promises and claims.
  7. Theinsanegamer

    Theinsanegamer TS Evangelist Posts: 1,547   +1,767

    What makes you think the 128TB SD cards will be anywhere below $100,000?

    Besides, the current SD card solution can support up to 2TB SD cards, yet the largest sold are 512GB. I doubt we will see 128TB SD cards anytime soon.
  8. DaveBG

    DaveBG TS Maniac Posts: 413   +154

    Great, I use a lot of SD cards.
  9. Bp968

    Bp968 TS Booster Posts: 101   +78

    Right, its just like how when windows went from 32bit to 64bit it could suddenly address vast amounts of memory. Just because it can doesnt mean you will anytime soon. That said this is a good thing. And it wasnt that long ago that a 1gb card was impressive and expensive and now you can get 128gb mSD cards for cheap.

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