Just bought a MyBook World Edition 2TB 2 days ago and had the same problem this morning
My network:
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a notebook with Win7 64 (bought a week ago, every updates possible were made)
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a notebook with WinXP SP3
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a netbook Samsung NC10 with WinXP SP3
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a Castlenet non-gigabit router provided by my cable company
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a D-Link 1008D switch connected to the router. The MyBookWorld is connected to this switch, as well as the Win7 notebook and the WinXP notebook
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there is also 2 PS3, 2 PSP, and other devices not concerned by this problem
So, I have 4 external USB disks to copy on the MyBookWorld
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WD Passport 250 with ~200GB of various files in type and size (from some KB to 1GB)
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an other WD Passport 250 with ~200GB of various files in type and size (from some KB to 4.5GB)
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WD Passport 500 with ~400GB of video files (size between 200 and 600MB)
The copy of the 2 WD 250 went smoothly, no error, no problem, it took some times but there was many files to copy. The Win7 laptop and the MyWorld stayed online more than 24H to do this.
Yesterday evening, after successfully watching some video on my PS3 via DLNA from the MyBook, I launched the copy of the WD 500, and this morning I found it stopped with 40GB left to copy: the drive was inaccessible.
Win7 can’t find it, I tried the WinXP laptop and it can’t find it as well, and the web-based interface was not accessible.
The power button on the MyBook seems to have no effect, so I disconnect the power.
I tried to copy the remaining files another time, but the MyBook became inaccessible after ~10min.
Once again, disconnecting the power, rebooting,…
Another try had the same effect…
So in the last 2 day I was able to copy more than 700GB on the disk without any difficulty, but this morning for the remaining 40GB, I can’t get it to work and this very annoying
After a third reboot, I hooked the WD 500 to the WinXP laptop and … the copy of the remaining files worked!
Many of the files on the WD 500 drive are 350MB files, but the directory it tried to copy when the problem occurs was full of 600MB files, and it is the only ones in this case…
Maybe the problem is with Win7 after all as pointed before. I will try later the solution given above.