What do the numbers of M.2 drives tell?


I’m looking for let’s say a WD Black SN850X NVMe SSD 1 TB SSD. So far so good.
But the number SN850x, what’s the meaning of it?
I also found the numbers SN550, SN750, SN570, SN770, SN500, SN530, SN700 and these are NUMBERS I just found.
Can someone explain this to me?
Then there are also the 4 colors, meaning of them are known to me. Makes it not easier to know what to buy.

Hi @Kos ,

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting:

Not of much help but…

For till-2012 HDDs (no M.2, no SSD): https://products.wdc.com/library/Flyer/ENG/2579-001028.pdf
Or search for model number + product family (or part number + …) on page: Resource Library | Western Digital

AFAIK for the colors: WD Hard Drive Color Codes: Black, Blue, Green, and Red | Western Digital
My interpretations:
Red: NAS optimized (no error correction, relies on RAID controller)
Purple: 24/7 but for light loads but tough build
Gold: Same as Enterprise/DC but still true HGST models
Black: Enthusiast consumer line
Blue: Mainstream
Green: Stay away. Power saving unintelligently