Issues with external HDD including USB, Firewire (IEE1394) and e-sata connections as well as issues relating to mounting, formatting and partitioning.
An external hard disk drive or external HDD is a device containing a drive attached to your computer via USB, Fireqire or e-sata and enables you to transport and store files on the device as a pose to utilising your main HDD.
Questions include usage of external drives and factors relating to them including mounting issues, using the disk utility etc.