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What is UEFI 'Legacy Rom' mode?

1) Why would a sata hard-drive need to be booted with 'Legacy Rom' in UEFI?
2)What is UEFI 'Legacy Rom' mode?
3) And finally, if the hard-drive had an old Linux on it from a computer which predates UEFI, upon reformatting, will I no longer need 'Legacy Rom' mode or is that less about software and dependant on some hardware features invented after this 150GB drive was made?

Thanks!
- A confused forum poster
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    HDD said:
    1) Why would a sata hard-drive need to be booted with 'Legacy Rom' in UEFI?
    2)What is UEFI 'Legacy Rom' mode?
    3) And finally, if the hard-drive had an old Linux on it from a computer which predates UEFI, upon reformatting, will I no longer need 'Legacy Rom' mode or is that less about software and dependant on some hardware features invented after this 150GB drive was made?

    Thanks!
    - A confused forum poster


    Legacy mode is for booting non UEFI supported operating systems. Pretty much anything other than Windows 8 is considered "Legacy".
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