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Troubleshooting Hard Drives and RAID Arrays (part 1) In this lesson we look at issues with hard disk drives and RAID Arrays and discuss some of the common issues that materialize with these devices. We examine the drive not being seen/recognized on boot-up and why that might occur, read/write failures and examine some of those causes such as a bad drive, cabling, or an incorrect slave/master slave setting. We also look at noises, such as a loud whining noise, or what happens if the operating system isn't found.