Sandisk ultra flair 3.0 USB flashdrive laying on a wooden bench-top.
https://media.bark.lgbt/media_attachments/files/113/267/405/134/651/667/original/f107b785ebe3d581.jpg
@iDave
I suspect it's the sandisk ultra flair.
The housing is metal and therefore you notice the flash running quite warm, more than with a regular drive.
This would be supported by @foone's thermal image showing the body at a lower temperature as it reflects infrared, compared to the plastic.
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