I just purchased a Thinkpad X1 Carbon Gen 9, and a Sabrent 4TB Rocket 4 PLUS (SB-RKT4P-4TB). Though both of these are NVME Gen 4, to my chagrin, the NVME drive purchased does not fit into the Thinkpad. It's too thick.

Two sided NVME and one sided nvme

One sided NVME on top of two sided NVME

Are there any NVME drives above 2TB that are one-sided? Is there any mechanism in which I can shop this without purchasing them all and opening them up?

  • Ask Lenovo Support. I have your machine right here plus an older X1 and a Lenovo M70s and the only SSD I can to fit is a 1 TB SSD.
    – John
    Apr 3, 2022 at 23:22
  • Why would Lenovo tell me if any 4 TB Single-sided SSDs exist? Presumably they're only the authority on what they sell. However, they do tell me this hardware supports 2 TB SSDs. Apr 3, 2022 at 23:25
  • I cannot answer that. My X1 Gen 9 is a month old, made to order and 1 TB was max.
    – John
    Apr 3, 2022 at 23:28
  • @John There are certainly 2TB drives that work in this unit, regardless of if Lenovo sells it.. crucial.com/compatible-upgrade-for/lenovo/… Apr 4, 2022 at 0:19
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    @EvanCarroll sorry, I've missed the "above" Apr 4, 2022 at 2:08

1 Answer 1


The maximum component height is defined in the type number by two characters after the first hyphen:

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Source: PCI Express M.2 Specification Rev 1.0 p.23

While this doesn't directly answer your question, this information should make it easy for you to find a drive with the correct specification.

  • That's only for TE drives, not an industry standard. The drive I just purchased (linked above) is the Sabrent 4TB Rocket 4 PLUS (model number SB-RKT4P-4TB). It doesn't seem to follow that convention. Apr 4, 2022 at 2:24
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    @EvanCarroll This is valid for all M.2 drives from any manufacturer. Note that there is a difference between a standardized devices type number and a manufacturers model number. Apr 4, 2022 at 2:33
  • @EvanCarroll I've edited the post with the same table from the official M.2 specification to avoid any further confusion. Apr 4, 2022 at 2:41
  • So without knowing how I can get a list of "standardized devices type number" how can I use this to answer whether or not such a drive exists? Aug 11, 2022 at 16:28
  • @EvanCarroll As you can clearly see from the chart, any drive with S1-S3 as the 5th & 6th digit of the type number is single-sided. Aug 11, 2022 at 16:34

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