MacBook Pro not detecting flash drive

Hello,
I have a MacBook Pro laptop (latest model) and I've encountered a bit of a problem with it.
When I plug a USB flash drive into either of the USB ports on the laptop, the computer fails to detect the drive and show it on the desktop.
However, when connected to my Thunderbolt Display and with the USB drive connected through the monitor or even through the keyboard (which is connect to the monitor) the laptop detects the USB drive without any issues. Also when I connect the keyboard directly into the laptop via USB and then plug the USB drive into the keyboard it detects it just fine.
The problem only occurs when plugging the USB drive directly into one of the laptop ports.
Any suggestions on how I can fix this?
Thank you

vas12345 wrote:
Yeah, it's just one drive. I think I figured out what the problem is. The USB drive is very old and cheap, most likely USB 2.0 but the ports on the MacBook Pro are USB 3.0 so there might be a compatibility problem.
In theory that should not be the case since USB3 is supposed to be backwards compatible to USB2. Perhaps the solution is to copy the data to a new device and trash the old drive. At least the cost will not be excessive.
Ciao.

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