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Windows 7: restoring saved image to smaller hard drive

04 Dec 2010   #11
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Quote   Quote: Originally Posted by Tepid View Post
I am not sure that would work,,, the geometry needs to be exact
If the partition/drive size is off by 1 less than the image size, or some other parameter is wrong, it will still fail on most imaging applications.

I have tried this in the past....

Try taking a 40G drive and image it.....

Then on a second larger blank drive,,, partition out a 40G partition and try to restore it.
More than likely it will fail. Something with the geometry will be messed up.
That's why you always have to go a few MBs smaller with the originating partition than e.g. 40GBs.


My System SpecsSystem Spec
.
04 Dec 2010   #12
mjf

Windows 7x64 Home Premium SP1
 
 

Quote   Quote: Originally Posted by whs View Post
Quote   Quote: Originally Posted by Tepid View Post
I am not sure that would work,,, the geometry needs to be exact
If the partition/drive size is off by 1 less than the image size, or some other parameter is wrong, it will still fail on most imaging applications.

I have tried this in the past....

Try taking a 40G drive and image it.....

Then on a second larger blank drive,,, partition out a 40G partition and try to restore it.
More than likely it will fail. Something with the geometry will be messed up.
That's why you always have to go a few MBs smaller with the originating partition than e.g. 40GBs.
That all makes sense.
But you can choose to shrink to a partition size some substantial size less than the available partition size you would restore to. You would end with some unallocated space in the restored partition wouldn't you? people don't seem to have problems restoring to larger partitions than the image partition size.
So I don't think this would be where it would fail.
My System SpecsSystem Spec
04 Dec 2010   #13
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Quote   Quote: Originally Posted by mjf View Post
Quote   Quote: Originally Posted by whs View Post
Quote   Quote: Originally Posted by Tepid View Post
I am not sure that would work,,, the geometry needs to be exact
If the partition/drive size is off by 1 less than the image size, or some other parameter is wrong, it will still fail on most imaging applications.

I have tried this in the past....

Try taking a 40G drive and image it.....

Then on a second larger blank drive,,, partition out a 40G partition and try to restore it.
More than likely it will fail. Something with the geometry will be messed up.
That's why you always have to go a few MBs smaller with the originating partition than e.g. 40GBs.
That all makes sense.
But you can choose to shrink to a partition size some substantial size less than the available partition size you would restore to. You would end with some unallocated space in the restored partition wouldn't you? people don't seem to have problems restoring to larger partitions than the image partition size.
So I don't think this would be where it would fail.
If you end up with unallocated space, you can always extend the partition later.

But I think people usually have this sort of resizing challenge when they come from a large HDD and want to replace it by a small SSD using an image to move the OS.
My System SpecsSystem Spec
.

04 Dec 2010   #14
mjf

Windows 7x64 Home Premium SP1
 
 

If I was thinking of an SSD it would probably be 128GB because 40GB wouldn't be big enough for my needs. 64GB prob ok.
So let's say my restored image is about 40GB. I would shrink the mounted volume size down to 60GB. Then make the Macrium image.
So I'd be restoring a Macrium image made from a 60GB partition to the new 64GB SSD. Then do a bit of unallocated space cleanup.

PS: But it appears that windows images are sometimes difficult for windows to reimage yet the vhd files appear fine. If the image is important enough this could be worth a try for that purpose as well.
My System SpecsSystem Spec
04 Dec 2010   #15
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Quote   Quote: Originally Posted by mjf View Post
If I was thinking of an SSD it would probably be 128GB because 40GB wouldn't be big enough for my needs. 64GB prob ok.
So let's say my restored image is about 40GB. I would shrink the mounted volume size down to 60GB. Then make the Macrium image.
So I'd be restoring a Macrium image made from a 60GB partition to the new 64GB SSD. Then do a bit of unallocated space cleanup.
That sounds about right - except I did not quite follow on the 40GB deal.
My System SpecsSystem Spec
05 Dec 2010   #16
mjf

Windows 7x64 Home Premium SP1
 
 

40GB is about the size of my images. Not to be confused with the OPs desire to use a 40GB ssd. If I had said my image amounted to say 30GB when restored it would fit on 40GB.
My example may have led to the confusion?
My System SpecsSystem Spec
05 Dec 2010   #17
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Quote   Quote: Originally Posted by mjf View Post
40GB is about the size of my images. Not to be confused with the OPs desire to use a 40GB ssd. If I had said my image amounted to say 30GB when restored it would fit on 40GB.
My example may have led to the confusion?
OK, understand. That's because of the compression. But one must take the original size of the partition and the size of the data therein to make the computation. The compressed size is really not important in that case. It is also important to figure binary against binary because the so called 64GB disk (in decimal) is only 59.5GBs in binary.
My System SpecsSystem Spec
05 Dec 2010   #18
mjf

Windows 7x64 Home Premium SP1
 
 

You have to do the arithmetic - agreed.
But you'd shrink your mounted volume to a sufficient size to fit the restored image. Thus leaving some free space/slack after reimaging.
My System SpecsSystem Spec
05 Dec 2010   #19
Tepid

Win 7 Ultimate 32bit
 
 

This is why I always advise that, if you swap out any hardware (any at all) it is just always best to start from scratch and build a new image off that for restore purposes. Just makes for a cleaner system in the long run.

Reason - If something goes wrong at anytime, you are not wasting your time trying to figure out what it is only to find out that it was moving an old image to new hardware that caused the problem in the first place.

It's a CYA deal.
My System SpecsSystem Spec
05 Dec 2010   #20
mjf

Windows 7x64 Home Premium SP1
 
 

Quote   Quote: Originally Posted by Tepid View Post
This is why I always advise that, if you swap out any hardware (any at all) it is just always best to start from scratch and build a new image off that for restore purposes. Just makes for a cleaner system in the long run.

Reason - If something goes wrong at anytime, you are not wasting your time trying to figure out what it is only to find out that it was moving an old image to new hardware that caused the problem in the first place.

It's a CYA deal.
It's a personal decision when to start from scratch. How much effort is involved etc.
Reasons why it could be useful
1) Windows auto image locate plays up. You know you have a load of time staggered images that you would like access to but Windows refuses to identify them. I haven't had the problem but many other have.
2) You have old images that you don't want to trash because your moving to a smaller SSD.
3) Starting from scratch could be a lot of effort particularly with a lot of paid third party software. Deactivtion/reactivation, updates to catch up on (inc. the OS) on etc...

Anyway under the right circumstances I'd give it a go.
My System SpecsSystem Spec
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 restoring saved image to smaller hard drive




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