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Windows 7: How does a VHD work?

31 May 2015   #1
BorisTheAnimal

Windows 7 Home Premium
 
 
How does a VHD work?

Hi,

I've tried to understand how they work and such but I'm still a bit confused and I do have a question, for example if you make a big virtual hard drive, does it take up "real" space or is it just virtual?

Like if I decided to make a 2 terabyte virtual hard drive would I then need for example a Seagate hard drive with 2 terabyte of space or would the vhd space really be virtual?


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31 May 2015   #2
groze

W7 32 bit, Linux Mint Xfce 18 64 bit
 
 

You would need space on the hard drive to hold the virtual drive.

You got two options dynamical, it will grow up to the maximum size you allocate or you can do a fixed size. Fixed size takes awhile to create. Either way it is still going to require space on your hard to maximum size you allocate.
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31 May 2015   #3
LMiller7

Windows 7 Pro 64 bit
 
 

A VHD is virtual in the sense that it is not a physical hard drive. But call it what you will it still requires real space on the hard drive to store it's data. That space is in the form of a file. Usually a dynamic VHD is recommended and in that case the file is only as large as the used space in the VHD. When files are deleted from the VHD the space may still exist in the VHD file. The downside it that performance may suffer if you create many files on the VHD. A fixed size VHD mayl provide better performance but it requires a file the full size of the VHD.
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01 Jun 2015   #4
BorisTheAnimal

Windows 7 Home Premium
 
 

Quote   Quote: Originally Posted by groze View Post
You would need space on the hard drive to hold the virtual drive.

You got two options dynamical, it will grow up to the maximum size you allocate or you can do a fixed size. Fixed size takes awhile to create. Either way it is still going to require space on your hard to maximum size you allocate.
Ah right thought so too, damn would have been interersting if not.
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01 Jun 2015   #5
LMiller7

Windows 7 Pro 64 bit
 
 

A VHD that didn't require disk space for data storage would be magic and in violation of the laws of physics.
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10 Jun 2015   #6
BorisTheAnimal

Windows 7 Home Premium
 
 

Quote   Quote: Originally Posted by LMiller7 View Post
A VHD that didn't require disk space for data storage would be magic and in violation of the laws of physics.
Aye but would be interesting nonetheless.
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 How does a VHD work?




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