An information storage medium, a recording/reproducing apparatus and a
recording/reproducing method are provided to increase data reproduction
efficiency. The recording/reproducing apparatus includes: a write/read
unit for recording data on an information storage medium and reading data
from the medium; and a controller for controlling the write/read unit to
record a replacement block by logical overwrite (LOW) for updating data
recorded on the medium in a first area of the medium, record a
replacement block for replacing a defect block generated on the medium in
a second area of the medium, and record a second replacement block for
replacement by defect of a first replacement block in the second area if
the defect is detected while the first replacement block is being
recorded in the first area to perform the logical overwrite of an
original block recorded in a predetermined area of the medium, generate a
defect list (DFL) entry including location information of the original
block and location information of the second replacement block in order
to indicate the replacement state, and move location information of the
first replacement block in the second replacement block. As a result, an
area for replacement by defect and an area for replacement by LOW are
discriminated from each other, and data reproducing efficiency can be
improved by effectively managing replacement information though the
replacement by defect due to a defect generated during the replacement by
LOW.