how do I find out what is using close to the full disk?

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  1. Posts : 42,735
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #21

    The 100% usage indicates maximum data transfer rate has been achieved, at what looks to be a low actual transfer rate.

    Have a look at Disk under the Performance tab to see what transfer rate is achieved. 'Disk transfer rate'

    Then perform some tests to try to identify why the max transfer rate is so limited.
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  2. Posts : 668
    Win 10 pro
       #22

    ironfist said:

    I want to know why the numbers at the bottom are different regardless of the fact that it says 100%. Again, at that moment, I know it's not disk space.

    I would expect the numbers to add up to the same thing when it's full, not only .26 megabytes sometimes.
    It is disk activity, while disk is active it is normal, many times it can not reach full transfre rate.

    Let me make an example, let say you can pull up 30 Kg, if they send you a 30 kg package outside you door you will be active 100% (you can not do anything else while you carry the package with both hands) and at full rate (30 kg)

    Let say now they send you 30 packages 1Kg each, you will be full active but at 3% of your transfer capacity, still you cannot do anythig else while you carry the 1 kg package so you are 100% active.
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  3. Posts : 1,345
    Windows 10 Pro 64-bit
       #23

    ironfist said:
    I appreciate the replies, but I want to clear up a few things.
    First, I don't think that is disk space. When it gets to one hundred percent my system slows down. I wanted to check task manager to see what was doing v it.
    I want to know why the numbers at the bottom are different regardless of the fact that it says 100%. Again, at that moment, I know it's not disk space.
    I would expect the numbers to add up to the same thing when it's full, not only .26 megabytes sometimes. In other words, how can .26 megabytes be full (usage, not space) but other instances an alternate number is full?
    I use Internet explorer and Firefox because I use two gmails at the same time on different monitors. I know not too long ago they changed it so you can be logged into each account in one browser.
    Everytime my computer slows down the main thing I do is check task manager to see if something is using too much memory. When I see it is full but barely anything is being used, I get confused.
    "I would expect the numbers to add up to the same thing when it's full, not only .26 megabytes sometimes. In other words, how can .26 megabytes be full (usage, not space) but other instances an alternate number is full?"
    I believe that has been explained quite a few times.

    "Everytime my computer slows down the main thing I do is check task manager to see if something is using too much memory. When I see it is full but barely anything is being used, I get confused."
    Please don't let it confuse you. We don't have control of how that's the way it is. If there were a way to fix those differences, there would be recommendations on how to do that.

    Let's concentrate on what's causing the computer to slow down.
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  4. Posts : 31,471
    10 Home x64 (22H2) (10 Pro on 2nd pc)
       #24

    dalchina said:
    The 100% usage indicates maximum data transfer rate has been achieved, at what looks to be a low actual transfer rate....
    Maximum transfer rate for an HDD is only possible for sequential access, typically around 90MB/s (test result 1 below). Random access will be much slower as it takes time for the heads to move across the disk (tests 2, 3 and 4 below). It would seem that when the OP's system slows down there is a lot of random access read/write activity going on. If so, defragmentation may help.

    how do I find out what is using close to the full disk?-pc2-internal.png
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  5. Posts : 42,735
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #25

    Granted, but what is seen there is absurdly low for 100%, do you not think?
    @ironfist What type of disk do you have?
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  6. Posts : 9,765
    Mac OS Catalina
       #26

    You system is slowing down if there are not enough available resources. In Task Manager, when it states that it is at 100% disk usage, it means that it is pushing so much data, that it is saturating your Disk I/O. You are again getting terms mixed up and what you see in Task Manager Process, has zero to do with how much is actually stored on your hard drive.
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  7. Posts : 42,735
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #27

    Sorry, who is? Just to be clear, I'm still referring to the transfer rate - MB/s not MB. I/O as you say.
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  8. Posts : 198
    Windows 10 Pro x64
       #28

    I think the 'per second' part in Task Manager is a clue ...
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  9. Posts : 42,735
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #29

    So can anyone suggest an appropriate test or diagnostic method? I recall seeing this symptom before, and trying straightforward checks as Bree posted, but the problem is something less obvious. I'll see if I can find a similar thread.
    Disk usage 100% please help Solved - Page 5 - Windows 10 Forums

    Meanwhile @ironfist - can you post the same as Bree posted above just for reference and confidence you can achieve reasonable figures?

    Do you have
    a. a hard disk drive
    b. the superfetch service disabled?
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  10. Posts : 41,412
    windows 10 professional version 1607 build 14393.969 64 bit
       #30
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