Ssd / usb3 uasp / trim

Discussion in 'iMac' started by MrGimper, Oct 7, 2013.

  1. MrGimper macrumors 601

    MrGimper

    Joined:
    Sep 22, 2012
    Location:
    Andover, UK
    #1
    I have a Samsung 830 256GB SSD that I have in a StarTech USB3/UASP Enclosure.

    Getting about 350 MB/s write and 400 MB/s read.

    UASP must be working as I was getting 200 MB/s write and 230 MB/s read in a non-UASP USB3 enclosure.

    Does anyone know if UASP supports TRIM? I know it supports NCQ, but I can't find anything definitive about TRIM support.

    Cheers.
     
  2. bobtennis macrumors member

    Joined:
    Jul 8, 2013
    #2
    No, USB 3.0 does not support TRIM, as this is an ACHI command not supported by USB 3.0 standards. UASP is a USB Chipset protocol version for USB 3.0 controllers, and although a faster chip for file transfer, it does not support TRIM commands. Thunderbolt does support TRIM however, as does SATA II & III in ACHI mode (as with all OSX).
     

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