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D: (Active time 100%, Disk queue length, process ID (PID)., write) -…
D:
Active time 100%
is the time the HDD is working. The higher the time/percentage, the more you utilize the HDD.
If you hit 99%, you are actually bottle-necked by the read/write performance of your HDD.
Bottleneck
a bottleneck occurs when the capacity of an application or a computer system is limited by a single component, like the neck of a bottle slowing down the overall water flow.
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Bottleneck literally refers to the narrowed portion (neck) of a bottle near its opening, which limit the rate of outflow,
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Disk queue length
Disk Queue Length, the higher the number the more disk operations are waiting.
process ID (PID).
process ID 4
System process (PID 4)
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pagefile.sys
Windows uses pagefile.sys for storing the data that would otherwise be in the computer's random access memory (RAM).
Sometimes there simply isn't enough capacity to hold all the necessary files in RAM, so pagefile.sys sits on your hard drive or SSD (C:\pagefile.sys) ready to receive data as necessary, and typically the least-used files in RAM are 'paged' out to this file.
write
When referring to data or a storage device, writing is taking information and moving it to an alternate location