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It is for this very reason that most copetently coded defragmenter utilities will stop a defragment operation if it detects the machine has switched to battery power as it assumes that if the battery power fails during a write there will be no further protection, so stops and will not resume the defragmenting until mains power is restored. Of course laptops don't need them if they have batteries that are in good condition. We can get reliable devices for less than £100. ![]() In this day and age it is foolishness to have tera-bytes of precious data on high performance machines without having some form of smart uninteruptable power supply. ![]() AUSLOGICS DISK DEFRAG PRO OFFLINEIf the data that has become corrupted was part of some critical boot file, windows subsystem then it could result in a non-stop reboot cycle until the damaged sector is remapped offline using a tool such as HDAT or Hard Disk Drive Regenerator. If there is insufficient power for a write operation to complete and save all CRC and ECC data and keep in sync with all the sector framing codes then that and any other associated sectors (in drives that have 4Kbyte physical sectors mapped to IDE 512byte sector 48BitLBA) will be corrupted and will be flagged as a "pending Sector" awaiting formal internal remapping to a spare physical sector. It is more risky to have a power failure during a defragment operation than most normal computer operations due to the much higher media write activity during defragmenting than in normal operation (excluding live video/audio capture or conversion operations for obvious reasons) AUSLOGICS DISK DEFRAG PRO CODEIf the powers gone the CPU cannot run any protective code can it! AUSLOGICS DISK DEFRAG PRO SOFTWAREno software alogorithm can save you from lost power during a physical write to any storage medium. Your query about a power outage during a defragment operation, either online or offline defragment operation without power supply protection IS A GAMBLE! Virtually all modern defrager utilities use windows defragmenter API to do the moves and as such it is designed to fail safe, BUT and that is a BIG BUT. AUSLOGICS DISK DEFRAG PRO PRO
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