I purchase 1Tb wired external hard drive its transfer rate is very good.
Normally if you want to check any hard drive speed .
The seek time is also less, when you give any request to find data then with out any delay you got yoUR DATA.I start copying of Photos then it done 2 gb data in 2 mins.
The hard drive also not produce any sound during copy and paste also .The price is high but for good quality you can pay that some of amount.
I want to suggest you that if you want any hard drive then try to buy Sony.
Thank you.