Files transfer as corrupted.

[TheSyntaX]

Hey, so long story short..

So I have a dead laptop (it wasn't cleaned for 5 years, so it takes literally 2 hours to boot up and it has hard time opening any files.
I connected external 3.5 HDD to it and transferred 37 GB of photos to it + some documents, it took about 2 hours.

Then I plugged in this 3.5 HDD to my main PC to check if file transfer was okay before I format laptops HDD, when I transferred all photos and files which took about an hour as well, some of the photos were corrupted and the documents appeared as a set of random symbols and characters.

Any idea what's wrong? yet on 3.5 HDD connected via USB they appear as fine.

Any solution?

[editline]30th October 2013[/editline]

Also, my cpu is pretty shite, Intel Pentium G860 @ 3.0 Ghz

When I connected my External HDD to back USB 3.0 port, transfer speed was 11 mb/s at max.
I was wondering if I take out external HDD from enclosure and plug it in via SATA, will that be faster?