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Thanks for all your feedback
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I have multiple HDD's with identical files replicated on each. I have 4 3TB HDD's. I want to combine them to one big partition to give me 12TB. What is the best method to do this and also the safest way to keep my data safe? I am sure I will need to buy some sort of case that has multiple bays. Can anyone recommend one?
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I have multiple HDD's with identical files replicated on each. I have 4 3TB HDD's. I want to combine them to one big partition to give me 12TB. What is the best method to do this and also the safest way to keep my data safe? I am sure I will need to buy some sort of case that has multiple bays. Can anyone recommend one?

Multiple HDD to one Huge HDD

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.

Storage

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.