I used My Book whole week, No problems.
Today it did not appear on my screen. The diskhelpprogram on my iMac shows the disk, but it is not activated.
I formatted in ex-FAT the disk as I bought it new last month, so it could be used on Mac en in Windows.
Where do I have to look?
If you need a server for mac and pc you will need one that uses SAMBA so it can be used like you want
What do you mean by server?