My flash drive is not being recognized by Imac

Hi I am new to iMac and I just bought it yesterday. I am trying to move everything from two laptops to my iMac. I have bought a brand new 8g flash drive and when I plug it into the back of the iMac, nothing happens. I took it to Best buy and had someone "format" it but when I brought it back home to try again, my iMac still did not recognize it.
I also have tried connecting an ethernet cable to the iMac and to the toshiba laptop and I cant figure out how to transfer everything.
Last question, when i plug in my iphone nothing happens on my iMac. When I plug it into my PC iTunes automatically pops up, why is this? and what do i need to do?
Thank you!

Plug in the flash drive in question. Open Disk Utility in the Utilities folder. In the lefthand sidebar do you see your flash drive listed? It will appear sort of like this:
Select the topmost listing then click on the Partition tab in the DU main window. Select one partition from the Partition Layout dropdown menu. Click on the Options button and set the partition scheme to MBR and click on the OK button. Set the Format Type to exFAT from the dropdown menu. Click on the Apply button.
You should be able to use the flash drive on both Macs and PCs.

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