Saveguard against device removal in os x

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OSX 10.10.3 MacBook Pro 15-Zoll

I'm currently writing an mac app which is writing files to a mounted device. Everyone knows not to (physically) disconnect a device while using it but sometimes it'll happen anyways, so i tested my app's behavior.

My app behaved reasonably (didn't freezed etc.) but there was something different happening. The path of my device is

'/Volumes/MyDevice'

and after i reconnected the device there where two entries in the finder

'/Volumes/MyDevice' 
'/Volumes/MyDevice'

but one of the entries was an empty folder the other was a mounted device.

And when i checked the url of the device with NSLog it said

'/Volumes/MyDevice%201'

I use NSFileManager to access the file system.

Does someone know what this behavior means ? Or if there are some special tactics with unmountable devices ?

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