![]() ![]() The Optimization option present in various defragmentation software fills the empty gap between files. The Defragmentation process locates and combines the file fragments together, and rearranges them into fewer fragments. In that case, an event will be reported requiring the file system to be repaired and lots of data could be lost. What is Fragmentation, Defragmentation, and Optimization Fragmentation happens due to continuous copying and deletion of files. ![]() In the worst case, metadata such as directory information or space assignment information may be lost. Today, my computer showed up as getting ready and then it finally shuts down after a long time, there were no updates as I have checked that. I have scheduled defrags turned off for all drives in Windows 10 and it still keeps defrags the C: drive randomly even if it is turned off. The last time I checked (twenty years ago or so), the data was moved to a newly-assigned unit of storage but the file data is lost, replaced with zeroes. How to disable disk defragment in Windows 10. The most interesting case is if all attempts to read fail and the space is in use. If it's a read, the read can be retried and, if it succeeds, new space be allocated, the data moved, and the bad space marked bad. If it's a newly-assigned unit of space or a write operation to existing space, then the space is marked bad and a new one is assigned. If there's redundancy (for example, if it's a RAID array) then the redundancy logic handles the situation. The same code handles the bad sector that would handle it in any other situation, say if the file was just being read or copied.Īssuming you're asking about NTFS on typical block devices, the process is complex. ![]() The defragmenter doesn't do anything special. ![]()
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