Thanks Jmass.
The rsssdm in SP145.07.08 only has a vmw-esx-micron-rssdm-2.10.5818.00.vib file and the micron-rssdm file inside it is only 130401 byte, pretty small.
The vmw-esx55-micron-rssdm-2.20.11180.00.vib file from SP145.03.08 should have a micron-rssdm with size 332120, much bigger ( I actually got a copy of the vmw-esx55-micron-rssdm-2.20.11180.00.vib from Tim so I know the correct size for the micron-rssdm in vmw-esx55-micron-rssdm-2.20.11180.00.vib , unfortunately seems it's corrupted, can't even extract it with ar).
The drives are directly purchased from Dell ( can't locate the part number right now, Micron part number P420m2DMTFDGAR700MAX ). Dell support hasn't able to find the working rssdm for me yet.