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SSD in WD EX2?

Can I insert an SSD into WD My Cloud EX2?

Sure if you have the correct form factor. You will likely need a caddy:

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Beyond just inserting a random set of SSDs which may or may not work, be sure to use the official WD Red SSD NAS drives:

I have used and tested sets of these in both a MyCloud EX2 and MyCloud EX2 Ultra dual-bay NAS and they work great for JBOD, Spanning, RAID0, and RAID1 configurations. I tried some other branded SSDs (e.g. Kingston) and they did not work in the EX2 series NAS.

I’ve used the Sabrent mount before and agree it is a good choice in general, but for the EX2 style NAS slots I use something a little more chunky that is roughly the dimensions of a 3.5" drive:

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I got one of my old black caviar HDD fail for the third time in a row and felt obliged to look at a better/more robust solution in terms of storage format for my NAS.
I’ve been looking for quite some time to upgrading my NAS with SSDs, without being sure on what to purchase (especially given the cost of such material compared to its HDD equivalent).

With the precious information you gave in hand, it made the purchase less painful.
Assuming it should work right away as it did for you.

Thank you very much @OmegaYeti for the precious tips.

You’ll need an adapter that aligned the connectors correctly. I’ve used this one successfully:

https://www.amazon.com/ORICO-Adapter-Mounting-Bracket-Interface/dp/B01LZWX6PD/ref=sr_1_1_sspa?crid=80PZ3UAMBPCS&dib=eyJ2IjoiMSJ9.hxczIPem2EHaczjG_oD_II7EyNiH_d8DIP5aMDOZzfdyIzswAn1luGIcJcYlhzSE2Cq270HN9w7M9EjQBC_ODi_m8jaTIF_I5rPFd3CNhUadTIXfLe4k1m1KM2v1JU0dSxcYnhRkRwC4HSntv0mcPDlW4cCv9HG_hMMGfWCd6RCy5rsCFiVGlHrHCZzfDzcj3PP8Kq9zN_Bk8cmFAnm5EVjE_wDYfl05UZ-PzZ8B2VKqdtFilgDf4ZSh3_-k3Osb_P0qSZnaPRZgU2UC-oO6WvhwAEiR3AIzAih_G2whn4A.QYoXItAX7WPWB9QbiuuLxgiiZW8R7kb7XkPkmvfq4WU&dib_tag=se&keywords=2.5%2Bto%2B3.5%2BSSD%2Badapter&qid=1705683019&s=electronics&sprefix=2.5%2Bto%2B3.5%2Bssd%2Badapter%2Celectronics%2C89&sr=1-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1

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