I have a total of 5 drives, 4 internal, 1 external. My system drive (C) is a solid state drive, the rest are HDDs. The external drive and the internal SSD are both fine. However, when I access (read, write) any of the other 3 internal hard drives, I hear a beeping sound coming from what I think is the computer's internal speaker. The beeping sound is more frequent when the activity is more resource intensive like copying files or playing a movie (as opposed to just browsing folders in Windows Explorer). Any time the computer makes the beeping sound, the HDD activity appears to pause for 2-3 seconds and then everything continues as normal. So let's say I'm copying a 2GB file from one HDD to another, I will hear the beeping sound maybe 10 to 20 times during the copying process and every time the progress bar will stop (and the time remaining estimate will increase). Then after a couple of seconds, the process will continue.
Since the problem is affecting 3 hard drives simultaneously, I can't assume that the problem is faulty hard drives. Can it be the motherboard, physical connections, or the operating system (Windows 7 Pro 64 bit)?
The computer is a few years old (Windows 7 era) and has 8 GB of RAM. The problem began about 2 weeks ago.