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29 July, 23:48

What would happen if the bitmap or free list containing the information about free disk blocks was completely lost due to a crash? Is there any way to recover from this disas - ter, or is it bye-bye disk? Discuss your answers for UNIX and the FAT-16 file system separately.

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  1. 30 July, 00:27
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    It can be repaired with disk utility / recovery algorithms

    In UNIX it can be done by scanning

    In FAT file scan the FAT looking for free entries

    Explanation:

    When the crash happens, it is not a problem for UNIX and FAT file system

    It can be repaired with disk utility/recovery algorithms.

    The recovery algorithm is a list of all blocks in all files and takes a compliment as new free file.

    In UNIX scanning can be done at all I-nodes.

    In FAT file problem cannot occur because there is no free list. If there was any problem than it would have to be done to recover it to scan the FAT looking for free entries.
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