Can I use this drive in this iMac?
Can I use this drive in my iMac Intel 21.5"EMC 2638?
SSHD-Harddrive 2.5" Bulk Western Digital WD10J31X SATA III
Is this a good question?
There are a few issues here you'll need to consider.
OK, you're going for it!
Make sure you have all of the correct tools and fully review this IFIXIT guide here: iMac Intel 21.5" EMC 2638 Hard Drive Replacement.
Now to the drive: Yes! The 2.5" 1 TB WD10J31X will fit and work in your system (review the spec sheet above).
But, are you sure you want to limit the SSD cache to only 8 GB? How about going with a different drive which has a deeper SSD cache (32 GB), it will give you better performance.
I would recommend going with the Seagate 2.5" 1 TB SSHD ST1000LX001
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