Run this command in terminal:
'mount'
That will show you what your path to your sd card is
Then run:
dot_clean /Volumes/sdcard
replcae sdcard with the volume name
Those files are indexing files for file searching on your computer (Mac OSX usually)
That's why there's two, the file and the index record to tell your mac that that file exists
No it does not. At least the head is different. Maybe he was talking about internal wiring? I just got one from amazon.com. it was like two dollars and I have Amazon Prime lol