extent data disk byte 0

[Anand Jain]

 In the item 7 below, any idea why would the disk byte be 0 ?
 (its not an inline extent)

 ----------
        item 6 key (257 EXTENT_DATA 0) itemoff 3531 itemsize 53
                extent data disk byte 456130560 nr 4096
                extent data offset 0 nr 4096 ram 4096
                extent compression 0
        item 7 key (257 EXTENT_DATA 4096) itemoff 3478 itemsize 53
                extent data disk byte 0 nr 0
                extent data offset 0 nr 258048 ram 258048
                extent compression 0
        item 8 key (257 EXTENT_DATA 262144) itemoff 3425 itemsize 53
                extent data disk byte 456265728 nr 4096
                extent data offset 0 nr 4096 ram 4096
                extent compression 0
 -----------

Thanks, Anand
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