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You should be able to as long as the motherboard will support that many hard drives.
The answer to this question depends on what you mean by totally different. Yes you can have varying styles of hard drives in a single computer, however you are of course limited by what your motherboard and operating system can handle.
Mine has 1 but my system can hold up to 4 DVD drives at once
Enhanced Integrated Drive Electronics (EIDE)
When a device is plugged into the system, what happens is dependent on what the device is, and what its capabilities are. If you plug in a USB HUB, it will not appear anywhere. If you plug in a camera, it depends on whether the camera has a file system that can be read by the computer. If you plug in a printer, it will appear in the system prefs under printers. It won't appear on the desktop. If a hard drive or memory card or thumb drive has a readable file structure, it will appear on the desktop. So, what happens depends on what is connected to the system. Just plain old thumb drives usually work fine in any computer.
CD drives are supported via a class driver; the operating system does not care what speed the drive is.
The hard drives that are permanently located inside the system unit and not designed for removal are typically internal hard drives or solid-state drives (SSDs). These drives are installed directly onto the motherboard or into specialized drive bays and are used for the primary storage of the operating system, applications, and user data. Unlike external drives, internal drives are meant to remain in the system until they need maintenance or replacement due to failure.
you have folder system in hard drives, because you can easily find your documents i don't know if it is correct so i hope is good for you
Each disk partition, regardless of whether there are more than one physical drives in the system, is given a drive letter.
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