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Windows 7: I need the memory usage particulars!

03 Aug 2012   #1

MS Windows 7 Ultimate 64-bit SP1
I need the memory usage particulars!

I have 8 GB DDR3 RAM on my laptop. Specs below.

I have started transfering complete data (~400GB) from one external HDD to another external HDD using Teracopy.

Below is the image of Resource Monitor. The free memory is showing very less value and sometimes 0. I have no problems with the system and it is working perfectly even now while moving the data.

I only want to understand the terminalogy of the below terms

Hardware Reserved - I assume this is taken by hardware device drivers.
In Use - Probably taken up by system and applications/programs.
Modified - ?
Standby - ?
Free - ?

and what is the difference between Standby and Free?

Attached Thumbnails
I need the memory usage particulars!-resmon.jpg  
My System SpecsSystem Spec
03 Aug 2012   #2
Carl Lawrence

Dual-boot: Windows 7 HP 32-bit SP1 & Windows XP Pro 32-bit SP2.

I think Free means it is not doing any thing. Standby bit might be used before uisng the Free bit. I might be wrong on this as I am only guessing.
My System SpecsSystem Spec
03 Aug 2012   #3

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1

What an interesting topic rraod. I wonder how many members have subscribed to this thread eagerly awaiting an informative response. I certainly have. Thanks
My System SpecsSystem Spec

03 Aug 2012   #4
Layback Bear

Windows 7 Pro. 64/SP-1

Hang the cursor over modified or any one of the others and it will tell you what it is.
My System SpecsSystem Spec
03 Aug 2012   #5
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

You are the lucky one - all your RAM is being used. The dark blue part is what the system (superfetch) uses to cache processes that you used earlier so that you have faster access to those in case you use them again. But this is 'available' RAM - meaning if the RAM is needed for more running processes, the cached stuff has to give.

You have very little 'Hardware reserved'. That is used for some BIOS functions. Some of it is explained here - read the text that is written in italics.

'Modified' is a temporary storage of items that the system still needs to write back to disk.

And 'Free' should be pretty clear - it is completely unused and as far as RAM usage management is concerned has the same status as 'Cached' - it is available.
My System SpecsSystem Spec
03 Aug 2012   #6

Windows 10 Pro (x64)

My System SpecsSystem Spec
04 Aug 2012   #7

MS Windows 7 Ultimate 64-bit SP1

I know him since Winternals days before it is changed to Sysinternals and then he joined Microsoft.
I have been using his products, Regmon, procmon, filemon, diskmon and ERD Commander etc. since 2004.

I have few ebooks written by him. Thank you for the above links.
My System SpecsSystem Spec
04 Aug 2012   #8


To put it very short, Modified shows the amount of data that has to be written back to disk before the RAM it's using can be reused. Almost but not exactly the same than Standby which shows the amount of cached data not used at the moment. Difference is that whereas the Modified data (cache) must be written to disk before releasing the RAM it's using, the normal cached data in Standby can be discarded if needed, without writing it back to disk.

Hardware reserved is as you suspected, the amount of RAM reserved for hardware and drivers. For instance if your GPU uses shared memory the amount of RAM it takes is shown here. In Use shows how much is used for apps running at the moment.

  • Installed = the amount of RAM installed on your PC
  • Total = Installed - Hardware reserved
  • Free = Total - In Use - Modified - Stanby
  • Cached = Modified + Standby

My System SpecsSystem Spec
04 Aug 2012   #9

MS Windows 7 Ultimate 64-bit SP1

Thanks Carl, Wolfgang, Layback Bear, Mitchell, logicearth and Kari for the explanation.
My System SpecsSystem Spec

 I need the memory usage particulars!

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