First Allocation Unit?

[gildan2020]

hi,

i got this from scandisk where it sez one of my files have First allocation unit not valid

can someone explain what it actually means?

also, scandisk converted it into a .chk file automatically, how do i stop that?
otherwise, is this .chk file still usable if i rename it back to its original name?
fyi, this scandisk runs automatically when the computer boots up (seldom happens though)


thx,
gildan2020

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