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I am currently developing an application which

copies all files from USB, when detected, to my local hard-drive

As I mentioned that I'm still developing, so I have to plug-in and plug-out my USB again and again to test my code.

Is there a way to detect USB again after Safely Remove Hardware?

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Answer from kolypto on ServerFault:

When you "safely remove" a USB HDD - it stops spinning. I believe there's a USB command to turn the device off (sleep mode, actually). So the thing you need is how to turn the device back on.

The application Safelyremove has a command-line tool that is capable of returning the device back: "Returning just stopped device back!".

It is shareware, but it works :)

  • Thanks @Keltari and kolypto. You saved my USB and my laptop's USB port. – Umair Mar 20 '14 at 14:34

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