Now, hard drive boards are being graded as high grade (SATA) and low grade (IDE and SCSI). Prior to the split, SATA and M.2 (with fingers) were graded as HDD boards.
I've got a couple SATA SSDs that are similar to this:
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Disregard the metal housing under it.
There are chips on both sides. My guess would be high grade HDD board.
But I've seen some SSDs with less population:
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This is not my photo as I don't have any examples with me, I found it here
https://www.youtube.com/watch?v=7C9ldcru8YsI'm not sure how the back side of the board is, but let's assume it has a controller chip, a caching chip, and 4 flash memory chips. What would a board like that be graded as?
And then, what about M.2 SSDs?