WD My Cloud EX2 2-Bay Personal Cloud NAS Review

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WD My Cloud EX2 Performance Benchmarks

To check the performance of the WD My Cloud EX2 4TB we ran CrystalDiskMark 3.0.3a x64 with the default settings. This is a quick and easy storage drive benchmark utility that shows the peak sequential and random read/write speeds.


The WD My Cloud EX2 topped out at 95 MB/s read and 64 MB/s write. These aren’t the fastest speeds that we have ever seed, but not bad for a NAS that is powered by the Marvell A370 SoC with 512MB of DDR3 memory.


ATTO showed that we were getting very respectable speeds of 98.4 MB/s read and 69.9MB/s write.


Rather than relying on synthetic benchmarks alone, we also used Teracopy and dragged and dropped a folder with 81 pictures and .MOV video clips from a recent retirement party and a few edited site images. The entire folder was 6.63GB in size and is the perfect real world test for the My Cloud EX2 as everyone backs up their pictures and movies. When copying the pictures from our desktop through our Gigabit LAN (powered by the ASUS RT-AC66U Gigabit Router) to the My Cloud EX2 we averaged 34 MB/s. It tool 197.627 seconds to copy the 6.63GB folder to the 2-bay NAS.


When copying the folder from the NAS back to a new location on our desktop PC we found that it took 106.13 seconds at 64MB/s.

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  • robert

    How did you disassembled the front case? I’d like to upgrade the fan to some more silent one, but don’t want to break the case..

  • Mark Oconnor

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  • James Brown

    Can the files be accessed by removing a drive from the enclosure and installing it in a PC? Just in case of device failure.

    • Massimiliano Adamo

      why you want to do that? if you have RAID1 your data will be available, even if one disk failed. There is no need to connect the disk to your pc.
      It’s however possible to read the data from a computer running linux, but you need to stop the raid (mdadm –stop /dev/md0) in order to get access to the device. Once the device is stopped I don’t know how the NAS will behave when you want to rebuild it.
      This is something that doesn’t make any sense.

  • kasimodem


    Thanks for the review. I’m looking for detailled informations about the noise level. I own a Synology which I find too noisy and would like to replace it with this EX2. Do you have precise informations about this ?


  • iBrick

    I didn’t seen any temperature measurements from the enclosure during various operations. That would’ve been nice to see.

  • namulit emperor

    Can the firmware of an installed hard-drive (WD Red or Seagate NAS drive let’s say) be updated when in this NAS?

  • SBrowning

    @ AbsoZed
    RAID Options: RAID 0, JBOD, Spanning

    Funny cause I’d rather have JBOD.

  • AbsoZed

    Wonder if it will be possible to put the thing in RAID0 as opposed to RAID1. It’s great to have a backup, sure, but I’d rather have 4TB space.

    • Nick

      It is – Page 4