Hard disk slow

WD External Drives WD Portable Drives
1

my hard disk is very slow especialy when you copy or past its taking too much time, 

2

try another cable, if possible in another PC.  You can also check the drive for errors using data lifeguiard diagnostics:

http://wdc.custhelp.com/app/answers/list/kw/291/st/5/sno/1/search/1/session/L2F2LzEvdGltZS8xMzI2NzM3ODQxL3NpZC9jeDhKR2lPaw%3D%3D