i would like to ask if a Raspberry Pi B+ can act as a Hard Drive using USB to USB connector? All i want is to access the MicroSD card of Raspberry Pi B+ to my computer using USB to USB connector? Thanks for your answer(s).
This is not possible as the Pi model b+ has a built in USB hub that prevents it from being configured as a slave device
one simple(yet troublesome) way would be to use a card reader and connect it to your computer. Otherwise, you can access the files remotely https://www.raspberrypi.org/documentation/remote-access/
Just follow the FTP part and I hope this helps ^^ Cheers