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My dual bay HDD enclosure got JBOD and DUAL modes among other modes. What is the difference between those 2 modes? I just want to know exactly because I am connectin a single hdd with data and I don't want it to be corrupted.

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For standard definitions of the terms (some manufacturers are terrible about this):

JBOD = Concatenation (Data written beyond the end of the first drive is written to the second drive). Addressed as one drive by the OS.
Dual = Two independently addressable drives.

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