(Solved) Bootrec: The Requested System Device Cannot Be Found
Bootrec console command, when run from USB thumbdrive or USB HDD in Windows Setup/Recovery session, sometimes produces the following error: "The requested system device cannot be found". This error is caused by multiplicity of System Reserved Partitions. First one exists on your HDD, another one exists on the USB thumbdrive you are running Windows Setup/Recovery session from. An attempt to update System Reserved Partition located on USB removable storage device leads to the "The requested system device cannot be found" bootrec error.
Instead of Bootrec console command, Mount & Boot Center of Emergency Boot Kit can be used to fix various Windows boot problems.
1. Symptoms of this problem
Bootrec console command produces the "The requested system device cannot be found" error message:
2. Cause of this problem
When Bootrec console command is run from USB thumbdrive or USB HDD, it has two System Partitions available:
So there are two NT6 bootloaders, two BCD hives and two of other System Reserved Partition's features.
Bootrec console command is confused by multiplicity of System Reserved Partitions, and unable to update BOOT_CONFIGURATION_DATA Registry Hive of System Reserved Partition located on the removable disk, because under normal conditions this hive is supposed to be located on the fixed disk. Hence the error.
3. How to solve this problem
Don't use Bootrec console command. Use Mount & Boot Center of Emergency Boot Kit instead. It can:
List of boot problems Mount & Boot Center can fix: