Name is d7100-v101m.dmg Thats it i don't think it copied to the s.d. card
OK so it's the .dmg file. Double click it and it will open and show you a folder. Inside that folder is the .bin file and that is the file you need to drag onto your mounted sd card.
1. Attach your card reader to the MacBook.
2. (Starting with a freshly formatted in the camera SD card) Insert your SD card so that it shows up on your desktop
3. Now drag and drop the .bin file onto the SD card so it copies onto the card
4. Now double click the SD card to see the contents, confirming that you successfully copied the .bin file to your card
5. If you were successful with step 4 then you're ready to insert the card into slot 1 of the camera and perform the update
Does this help?