Disk for the module B

I’m quite confused by the possibility of adding storage inside the Mox. Module B has a mini-PCIe slot but today, it seems impossible to find a mPCIe disk. Most small SSD for similar machines use M.2 (for instance, this Kingston) which does not seem compatible.
Is there a realistic option to buy and connect a disk in the Mox? Or should I use an external USB drive?

There are mPCIe to m.2-adapters available, so you have options to install m.2-SSDs.
The only downside is the bandwidth of mPCIe is limited to 2,5Gbit, you will not make much use of faster SSDs (PCIe3.0x4 → 32gbit, PCIe4.0x4 → 64Gbit, etc). But as the fastest way you can connect to your MOX is also 2,5Gbit (via SFP-port /module D), the SSD is not the limiting factor.
As I have quite a while searched for the most efficient mSATA-SSD, I know there are 1TB-SSDs available. But for sure there is no further development, energy consumption of mSATA vs. m.2 is really bad and you can get m.2-SSDs up to 8TB maximum storage…

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Did you try that (the adapter)? Which model? Does it fit in the Mox? Does it work (the performance issue is not really a problem)?

I didn’t try with a MOX, I installed it in one of my TOs: New For M.2 NGFF NVME M-key/B Key SSD to Mini PCI-E Adapter Card M.2 B/M Key SSD | eBay (and as it doesn’t really fit in there it is a little bit inclined what doesn’t matter as long as the connectors sit tight; I installed a m.2 2280 in it).
Regarding the length just measure within your MOX’ enclosure if it fits - total length is 9,5cm (without connectors of the adapter). If it doesn’t fit, you can try to use a riser card in between.

It does work, yes:

root@turris:~# lsblk
mtdblock0     31:0    0     1M  0 disk
mtdblock1     31:1    0     7M  0 disk
mmcblk0      179:0    0   7.3G  0 disk
└─mmcblk0p1  179:1    0   7.3G  0 part /
mmcblk0boot0 179:8    0     4M  1 disk
mmcblk0boot1 179:16   0     4M  1 disk
nvme0n1      259:0    0 931.5G  0 disk