Since I updated my EX4100 to OS5 I have noticed the drives never stop. I am well past the initial indexing phase. I checked the status to find it is "Generating Profiles" or "Retrieving Information". The CPU is nearly always over 50% utilization as is RAM. As it has been mentioned by others this is just going to wear out my drives a lot quicker. Another thing that I am left with is that the workstation no longer maps persistent drives via the UI under OS5 to the EX4100. I have to login to the EX4100 each time with problems. Finally after days I figured out to run the mappings via a batch file. An extra step but, it works clean. Puzzling. Mappings under OS3 worked just fine under the WIN UI. I have actually been mostly happy with this device for what I use it for. I only use it to store files, largely photos which can be 10-20 Mb + in size. It is a 9Tb, RAID 5 setup. I only have the USB Backup utility loaded and use it to make backups periodically. I have had some issues with it that I get around. Under OS3 it was slow for any remote access. Using WiFi to transfer files was just a killer. I had to hard wire (@1Gb) the workstation to the EX4100 to get my best response, which is workable. Remote access to my cell was too poor to use. With the Upgrade to OS5 I do get better response remotely. Files surface faster and I can now use my cell to get at the photos albeit a bit slow. The new RAW format used by Canon, CR3, does not work within the EX4100 software environment for viewing. I am concerned about some things and would like WD to respond to. First, why is the EX4100 running all the time? Under OS3 it did sleep while I was not actually using it. Second, Am I the only one having mapping issues? Under OS3 it did work. Third, Anyone else using Canon gear needs the CR3 file format to work. Forth, Does WD explain what they did in OS5 that now gives better access remotely. Where are the indexed files stored and are any of the files stored on my device copied in any way off my device. WD, "Generating Profiles" or "Retrieving Information" from/to where that this would require so much resource?