PollBootPartitionTimeout (Standard 7 Package Reference)
PollBootPartitionTimeout specifies the amount of time, in milliseconds, to wait for a flash device to boot.
To ensure that the system can properly boot from a flash device, this setting changes the PollBootPartitionTimeout registry key value. This registry key is used to control how long the kernel waits for PnP to surface the boot disk before it stops with bugcheck code 0x7B.
On initial validation, Image Configuration Editor displays the following message in the Validation tab: Package "Bootable Windows USB Stack" would like Setting "PollBootPartitionTimeout" in Component "Kernel-PnP" set to the value "15000".
The default value for this setting is 0.