Do ssds from current WD Blue 3D nand series support RZAT or DRAT?


#1

As in subject - do those drives report “Deterministic read zero after trim” correctly ?

All modern drives behave this way - and basically any older model from past few years reported this feature (or at least older “Deterministic read after trim”). For reasons unknown (marketing ? encryption ?) recent models from other vendors (we tested crucial’s mx500s, adata’s sx950u, samsung’s 950s and 960s) stopped reporting rzat/drat altogether.

This makes it particularly frustrating when you put such disks behind e.g. LSI controllers that block trims unless rzat or drat is supported.


#2

Hi Msoltyspl

for WD Blue 3D NAND SSD

Word 69 bit 5 und bit 14 are both set to 1.

Meaning the returned data is zero

Word 105 is set to 8.

Meaning maximum DSM payload is 8 512-byte blocks.


#3

Thanks for the information !