We've found the following process to move the boot files from the System Reserved partition to the C:\ primary partition so that the system will boot Without the need for a SR partition.
NOTE: This process applies to Win 7 & Win 8.1. While this process also appears viable with Win 10 based on our preliminary experience using it with that OS we would prefer to gain further experience employing it with that specific OS before recommending it unreservedly.
AS A CAUTIONARY MOVE BEFORE UNDERTAKING THIS PROCESS WE STRONGLY URGE THE USER TO CLONE THE CONTENTS OF THEIR SYSTEM DISK TO ANOTHER DISK. WHILE WE'VE FOUND THIS SYSTEM CONFIGURATION CHANGE CONSISTENTLY RELIABLE IT DOES REPRESENT A MAJOR SYSTEM CONFIGURATION CHANGE TO A USER'S PC SYSTEM AND A FALL-BACK POSITION SHOULD ALWAYS BE AVAILABLE TO THE USER SHOULD THINGS GO AWRY.
AGAIN, IT IS IMPERATIVE THAT THE PC USER NOT UNDERTAKE THIS PROCESS WITHOUT FIRST CREATING A CLONE OF HIS/HER BOOT DRIVE.
1. Open a command prompt (Elevated Command Prompt) with administrator privileges: C:\Windows\System32>
Type: bcdboot c:\windows /s c: <Enter>
You should get a message: "Boot files successfully created."
2. Open Disk Management, locate the C:\ partition, right-click and select the option “Mark Partition as Active” from the sub:menu; click Yes to the confirmation message.
NOTE: Should Disk Management have the "Mark Partition as Active" option grayed out, use Diskpart to mark partition Active, as follows...
Select Partition
Active
3. Reboot to confirm that everything is OK, i.e., the system boots without incident and properly functions with no problems.
4. In Disk Management you can now delete the System Reserved partition by right-clicking on the partition and selecting "Delete Volume". The resultant disk-space will be "Uallocated". In most cases the SR partition had been created in the drive's disk:space located before the C: partition. That being the case you cannot utilize Disk Management to extend the C: partition to incorporate that unallocated disk-space. Since only a rather trivial amount of disk-space is involved it would seem there's no great urgency to utilize that disk-space for more productive purposes. However, most third-party "partition management" type programs possess this capability if it's of some importance to you.
5. In some cases it's necessary to assign a drive letter to the System Reserved partition before you can delete it. Also, it's sometimes necessary to use the Diskpart utility to delete the partition by selecting the partition and invoking the command "delete partition override".
6. The SR partition can also be deleted in Disk Management when the drive is connected as a secondary drive.
7. If all else fails and the system prevents deletion of the empty System Reserved partition no great harm ensues as long as you have a bootable, functional drive.
Hopefully in your situation you will be able to follow the above steps so that your 250 GB drive will be able to boot straightaway without the need of your 40 GB drive containing the System Reserved partition being connected in the system.
BUT TO REITERATE...ENSURE THAT YOU FIRST CLONE THE CONTENTS OF YOUR 250 GB DRIVE BEFORE UNDERTAKING THIS PROCESS SO THAT IN THE EVENT OF FAILURE YOU WILL BE ABLE TO RETURN TO YOUR ORIGINAL SYSTEM.
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