Hello All,
So I have bought some of these drives on eBay for a fairly good price. Seagate's model numbering is quite confusing, also this drive is not listed on their website since it seems to be a NetApp OEM drive. The same drive but with 600GB size, ST600MM0099 is listed as a 4Kn (switchable to 512E via Seagate fastformat), 256MB cache drive with 16GB eMLC NAND for "Enhanced caching features".
I could not find any proof that the ST900MM0099 has NAND cache, but I wanted to find out. The drive is quite fast:
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Screenshot 2021-09-30 222746.jpg [ 78.93 KiB | Viewed 6097 times ]
I had the idea of asking Seagate Support. First, they did not understand what I meant. They asked me to explain what eMLC is
After a few round they have confirmed that while the drive has 256MB cache it does not use eMLC NAND cache. Bummer. Somehow I did not believe them and had the idea to carefully remove the PCB. Surprise:
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20211026_212902_resized(1).jpg [ 1.42 MiB | Viewed 6097 times ]
Looking up the part numbers, to the right is a 256MB Samsung DDR3, to the left is... 16GB Hynix MLC NAND.
Now I kindly asked Seagate support to confirm if the drive has NAND cache installed but disabled (not likely).
What do you think?
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