I got today a MyBook World Edition 1TB.
First thing I did was to upgrade the firmware to 22.214.171.124, enable ssh and turn on nfs sharing since I am using Linux and it's more convenient for me.
I had four files of 1.2GB on my machine, each spanned on 12 rar archives. That makes 48 rar files, 100MB each. I transferred them to MyBook through nfs.
Since MyBook runs Linux I thought it would be fun to ssh to it, install unrar through optware and use MyBook to unrar them!
Here the problem begins. Three files (of 48 total) were corrupted and unrar gave me a CRC error. Since these belonged to different archives I was able to get back only one of my four 1.2GB files!
Rather alarmed I tried to uncompress the originals on my computer. No problem at all.
I transfered the "broken" files back to my computer just to make sure it wasn't the optware version of unrar the problem but the unrar program on my computer found them too corrupted.
After some more trials it was clear that some -random- files get corrupted during transfer TO MyBook (and not FROM MyBook).
I copied the files to an external usb hard disk, connected it to MyBook, ssh'd to MyBook and copied them to the internal hard disk. There was no problem there.
So the problem had to be the nfs or the network.
With a little search I bumped on some threads on Debian mailing list describing the same problem though it was about Linksys NLSU2 and Thecus N2100.
Here are some links, the first one is more clear:
Notice that I also had the "nfsd: non-standard errno: -14" message on my dmesg.
It isn't still clear to me if the problem is in the nfs or the network implemantation but some people claim about a similar problem with SMB (samba). There is one old thread in this forum too.
There isn't a fix available but there are some advices to minimize the problem which I intend to try and inform you.
Please notice that data corruption is one of the most serious problems but it can go easily undetected.
If you mainly transfer movies or mp3s to your MyBook it is possible that an error may go unnoticed.
But in archives (zip, rar, etc) and other types of files the problem won't go unnoticed and you may loose your files.
So, has anyone else noticed?