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I have usb hard drive formatted in exFAT which last time was plugged in Windows 7. Now I'm on OSX, but it's not so important.. - is there way to figure out when it was last plugged in ?

wikipedia exFat page indicates that exFat somehow record access dates
but how properly read it ?

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In windows, it is possible to find out the last time some USB device was connected to that specific PC by running USBDeview, one of its columns is the "Last plug/unplug date". Said device doesn't even is required to be connected

Your question is a little unclear, if you want however to know the last time a device was used/plugged in, by pluging said device to a new computer and examining some property, I don't know if this is even possible.

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