Fun fact: Due to rotational speed, beginning of a HDD is fastest, so Windows logs files accessed during boot to move them, speed itself up.
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Fun fact: Except for some early and dangerous implementations, all defragmenters use the same API to move files. They never have raw access.
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Fun fact: NTFS actually uses branching layers of pointers to keep track of file fragments on the disk.
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Replying to @SwiftOnSecurity
Do defragmenters defrag SSDs? Does it make a difference?
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Replying to @FernRoyal
Not strictly no. SSDs need different kinds of maintenance like TRIM.
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Replying to @SwiftOnSecurity
TRIM helps change read-erase-modify-write ops to write. Helpful due to rules that Flash can't erase single words, only blocks. IDNKT
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Defrag on SSDs should still help but to a much lesser extent (only if extremely fragmented). More fragments = more ops to send to the drive.
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Also having commonly moved/written/erased data laid out contiguously *may* help out some wear leveling algorithms.
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