Are the speeds of: SD, USB, eSATA all different?
Currently, is there a solution for something near the size of nvme drive?
Depends. On my Chronos 1.4 eSata was fastest, when writing DNG files.
Because you'll likely have
a few of those for each take, an SD-Card will quickly become sluggish when forced to random write all those images.
Oh.. isn't the USB port 2.0 still? Even on the 2.1? That would make eSata indeed a smidge faster
If you just export as x264 video, speeds are almost the same on each storage option and are mostly limited by the internal encoder.
Very old thread, so, could be quite different today:
https://forum.krontech.ca/index.php?topic=442.msg2307#msg2307I only found
one external 2.5" case with eSataP port, here in Germany, but that was quite a while ago. ESataP isn't the most popular IO connector, it seems. While I'm OK with the 2.5" casing, a more compact one for NVME certainly wouldn't hurt