[dba-VB] [SPAM] Create and Use a Virtual Hard Disk on Windows 7 and Windows 8

jwcolby jwcolby at colbyconsulting.com
Sun Dec 2 19:28:01 CST 2012

VHDs have been around forever.  Back in 1990 I went for work as the (entire) test department for 
Stack Electronics, maker of Stacker data compression.  The way that Stacker worked was to create a 
file which was mounted as a disk and then the driver wrote / read from the disk performing the 
compression as it did so.

Obviously there is a performance hit as you manipulate the structures in the file to make it look 
like a disk however today we have so much processor power that the overhead is down in the mud. 
Look at compression in SQL Server, where they store compressed data in SQL Server objects - tables 
and indexes.  It is actually read into memory in compressed form and then uncompressed as it is 
used.  Yea, it uses processor power but the average server often just cruises along mostly unused.

Is the average Windows 7 desktop user going to notice the overhead of reading and writing to a 
virtual disk?

John W. Colby
Colby Consulting

Reality is what refuses to go away
when you do not believe in it

On 12/2/2012 6:15 PM, Salakhetdinov Shamil wrote:
> Hi All --
> Do you use Virtual Hard Disks on real computers and on VMs as e.g. it is described in the following article:
> "Create and Use a Virtual Hard Disk on Windows 7"
> http://technet.microsoft.com/en-us/magazine/ee872416.aspx
> ?
>   I wonder wouldn't using virtual hard disks result in some (significant) performance hits especially when  virtual hard disks will be shared on host computer to use them from VMs via "Map Network Drive" feature?
> Thank you.
> -- Shamil
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