What is an acceptable transfer rate?

Hi, some users are able to get between 50/60 megabytes per second. Check the link below for some suggestions you can try to improve the transfer rate. 

http://community.wdc.com/t5/My-Book-Live-Duo/Stupidly-slow-My-Book-Live-Duo-2TB/m-p/566764#M4420

When transferring large files to or from the My Book Live performance may be slower than expected