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Why i can not recover a 101 GB size partition to a 118 GB unallocated space ssd drive

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I have made a backup of a 500 GB drive which contains Windows, EFI and Windows recovery tools partiotions. The total size is 101 GB, 350 MB and 500 MB correspondignly. I try to recover all these partitions to a new 120 GB ssd drive which is to be installed in another PC. I can choose new ssd as a destination for both EFI and Windows recovery tools partiotions. But it becomes grey and unavaliable for choosing as a destination when I try to recover a Windows partition to it which is 101 GB in size and I have 118 GB free space on the new ssd drive.

Why is it happening and what should I change to fix this?

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Mihail, welcome to these public User Forums.

Sorry but it sounds like there would be still insufficient free space for your disk recovery if you would only have 17GB free space on your new 120GB drive.

If you still have the original 500GB drive, I would suggest trying to reduce the 101GB partition down to around 90GB then make a new backup and try again with the recovery.

Any SSD quoted as 120GB will actually have less space that than - this has always been the case with drive capacity, plus it is recommended that you need around 20% free space on the drive.

Agreed with Steve,

Many SSD's "usable" space is much less than the advertised size on the box.  There can be variances between manufacturers on the true amount of usable space where a 120GB might actually end up being 100GB, 105GB and 110GB usable space between the three different vendors.  You don't usually know until after you've initialized the disk as assigned it a drive letter to see how much is "usable".  

All SSD's need to have some reserve space on the disk for caching.  SSD's slow down and can be really poor performers when they are below 20%, and especially below 10%.  So, if you are planning for space, calculate that in and try to go bigger if the price isn't too bad.  In this case, a 240GB SSD should do the trick if your data doesn't grow much. 

The PNY 240GB or Silicon Power (SP) 256GB SSD are both on Amazon for about $29 USD and their 480GB/512GB step ups are in the ball bark of $50.

The comparisons of SSD (both SATA and NVMe) that I have seen indicate that when a drive come in multiple capacities, performance is invariably better for those with larger capacity. Other test indicate that performance hits as drive becomes fuller that performance can suffer more noticeably than with HDDs. 

For optimal performance I aim to have usage of 50% or less on OS drive. Given the price of SSDs today that is not an extravagance 

Ian