Hi, this problem has been breaking my brain for some time. I have Win 7 Pro x64 installed on a separate boot drive and have built a RAID 5 array on a LSI SAS 9261-8i to store my data. The raid controller is fine, always loads, reports no problem with the driver and the data array is always there following boot. I check the array with Directory Opus and all the folders and files are just fine.

The problem occurs when I try to perform file operations such as copy, move, or expand a zip fie, and most everything else. The operation will proceed for a few seconds and stop with a notice that the path cannot be found. The array will have completely disappeared from windows and won't be back until I re-boot. Even so, LSI's MegaRAID Storage Manager program still shows the 9261-8i controller as optimal! Proton Annual Report Pdf there. There's just no array anymore!