[Mac] Mac air notebook problem need help

nt1972

I have a USB ex-HDD with NTFS format, I can send (drop) file from the ex-HDD to the MAC air notebook but I can send (drop) files from notebook to ex-HDD!! please help

nt1972

but this usb ex-HDD is also need to use under win 7 system, so basic on what you need that I need to buy another USB ex-HDD for fat32 or NTFS but need to format to fat32

nt1972

ok, totally understand!!do you know any website to show me how to setup networking for both Mac & PC to share resource.