original product and transfer speed depends on type of files max for me 130mbps for an iso file no problem of overheating i keep it connected for 2 days for downloading forza horizon 4 and usable size is 137tb otg supported and quality is good there are four mini rubber grips also at bottom and a led indicator light on front i created a partition of 30 for a extra operating system we can create many partitions to install operating systems and boot using this hard drive