Defrag SSD

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  1. Posts : 1,962
    Windows 10 Pro x64

    " modern HDD ".............a HDD is still a HDD ( mechanical,spinning ) , totally different from SSD !
    Never defrag SSD !!
    While defragging HDD not necessarry anymore.............
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  2. Posts : 50,055
    Windows 10 Home 64bit 21H1 and insider builds

    RolandJS said:
    Thanks, Kado! I learn something new every day :)
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  3. Posts : 56,860
    Multi-boot Windows 10/11 - RTM, RP, Beta, and Insider

    Another note on defrgging MR images, or any very large image files similar....... they are intended to be read only, you cannot write to them any more. Since, hopefully, you never have to read them, organizing the blocks of data to be contiguous is fruitless, and just wear and tear on the heads.
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  4. Posts : 1,807
    Windows 10 Pro 21H1 19043.1348

    Modern HDD or otherwise, depending on the use, defrag is still a function I use.

    I have my OS on an NVMe and most everything else is on a HDD. Contiguity of files on that modern HDD is still important to me.

    If you care to make the statement, defrag isn't required on a modern HDD that's used specifically for large file storage like backup images, I would be agreeable.

    The idea of not using defrag on a HDD could be misleading to those less experienced users unless the statement is qualified. Just my 2 cents.

    BTW, I don't defragment my image backup drives either.
    Last edited by W10 Tweaker; 12 May 2021 at 02:10.
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  5. Posts : 18,443
    Windows 11 Pro

    Here's the thing. Do whatever floats your boat. If you feel better when Defraggler has an all green screen then go for it. If everything is working fine for you just letting Windows handle defrag with defaults, more power to you! If you want to turn Defraggler loose on an SSD so that you get all green squares, go for it!

    If anyone asks me for my advice, my advice to just let Windows handle it, caveat being that's what works best for me. That may not be what works best for anyone else.
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  6. Posts : 4,861
    Windows 10 preview 64-bit Home

    Just for info, I have an external SSD, UAS protocol, drive for backup. Because of that protocol it shows up as a Hard Drive under Optimize drives. Running optimise it actually trims the drive. Took a few seconds. So Windows will still correctly trim rather than defrag the drive.
    Defrag SSD-screenshot_5.pngDefrag SSD-screenshot_6.png
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  7. Posts : 11,246
    Windows / Linux : Arch Linux

    Not this old perennial again.

    There really is no reason to waste any time on defrag of even modern HDD's these days -- for SSD's it's pointless -- there's no moving parts so data adresses anywhere on the SSD are essentially a 2 -D array so it doesn't matter where the data is stored even if all over the disk -- data access is the same wherever data is available and even if it takes a few microsecs longer to assemble a file - the cache and data I/O pre-fetch algorithms in the Windows kernel render any user perception of improvement totally un noticeable !!! -- so what would be the point of defrag anyway.

    Same with TRIM - IMO the best thing to do with SSD's is just leave them alone -- I'm using some old ones daily that are more than 5 years old and I can't say speed of the Disk I/O subsystem has bothered me one jot even though it's often poor Disk I/O that is the cause of a lot (nearly all in fact) of Windows performance problems.

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  8. Posts : 19,520
    W11+W11 Developer Insider + Linux

    Instead of guessing and/or thrusting Windows to maintain de-fragmentation of mechanical HDDs, use a dedicated program like Disk speedup Disk SpeedUp - Free Defragmenter to Defrag Disk for Best Performance | Glarysoft and you will be able to see fragmentation %
    Even during "Bad old times" with Windows 95/98/XP, only over 15-20% fragmentation had any influence on disks performance while HDDs at that time were much slower and therefore more susceptible to slowdowns.
    "Modern" HDDs are much faster and have own Firmware/BIOS that's much "smarter" in the way it places data on physical disk surface and also have large cache which can selectively write data on disk further reducing fragmentation beyond what OS does.
    Furthermore, OS like Windows sees only logical data distribution which doesn't always coincide with physical placement of data on disk surface. Example: even if Disk Management shows first partition, data in it may be somewhere else on disk surface.
    Yet another thing, "modern" HDDs, specially high capacity, have multiple disks and each one has 2 own heads while often even those separate heads may have 2 or more sensors that cover several tracks on disk. That way one large file may be and often is spread among multiple tracks and disks ut in a program and OS it shows as a single, continuous space.
    There are even some good things about (apparent) fragmentation. Many programs (including MS Office and even games) that handle large data bases intentionally leave empty space at end of data files to be able to write them in continuity to expand fast without searching for free disk space so if you force continuity it would negate that feature and force disk heads to "trash" around searching for free space to write to.
    Solid State Drives are even more different "beast", able to at same time read and write to data cells which are assigned by single controller which all data (while reading and writing) refer to before any action, in practical use that happens instantaneously introducing minimal delays in micro seconds. Difference between logical and physical formatting and data placement is even larger than in HDDs, a cell with certain data that OS or program may see could be entirely somewhere else. Even if a defrag program "thinks" it moved data, controller will still place data where it "wants" to.
    Just about only thing that can slow data write is that it may have to erase data cells with data marked as deleted before writing to them if it can't find wholly empty ones. What makes SSDs even faster is that cells (transistors) are placed only few micrometers apart with electricity having to go (at light speed) at most couple of millimeters. Any other possible slowdown when erasing and writing is handled by Garbage collection and Trim command and in most modern SSDs it's handled in firmware during "quiet" times when enough resources are left for the controller. That also happens in micro/milliseconds and is not transparent to users or OS.
    Soooo..... defraging an SSD, specially newest ones is illusory, changes nothing.
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  9. Posts : 56,860
    Multi-boot Windows 10/11 - RTM, RP, Beta, and Insider

    Almost 4 weeks later, 6 pages and 58 (59) posts and the OP's question has not been answered. If so, I can 't find it. Just saying,........
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