Talking about Seagate slim 500 Gb external hard disk, it has a writing speed of 110 MB/sec and reading speed of 111.5 MB/sec. I have purchased this hard disk in year 2015 and it worked quite well for me until it was able to connect to my Desktop computer but didn’t worked with my laptop. I returned the hard disk to the local store keeper from whom I purchased it and it almost took a month to get my hard disk back but unfortunately everything was erased. ??