Definitely saw an issue related to Drivers for 'iaStor.sys' on the HP model 6730b laptop. If the Driver on your system is version '8.6.0.1007', and this can be found using [Start] > Programs > Accessories > System Tools > System Information, then 'Components' > 'Storage' > 'IDE', you should consider the update from HP's site.
I ran into an issue where the User was seeing a Blue Screen with 'STOP:' message and the code 'D1' in the Hex part, and HP specifically covers this in the 'Revision History' of the available Storage driver.