Crcdisk.sys is a system file located within the Windows operating system and is a Disk Block Verification Filter Driver. While Crcdisk.sys is not something that many people see on a daily basis it is an important file in the Windows operating system and a required file to start a system up.
Many times users will see Crcdisk.sys on their screen during start up and sometimes the screen will pause and the start up will not be able to be completed. If this is the case and you are seeing Crcdisk.sys but no more boot up after that then there are a couple things listed below that can be done.
The first thing that can be done is to run a full system scan with a registry cleaner. This is very helpful and will often help resolve any issues related to Crcdisk.sys as the file is located within the operating systems folders and many times this operation will reference a piece in the registry.
If the registry has become corrupt or changed and Crcdisk.sys is trying to reference an entry there is a possibility that the computer will no longer be able to start up and shut down correctly.
The second possibility is that the Crcdisk.sys file itself is corrupt. If this is the case the best thing that can be done is to put the system into Safe Mode. Once the system successfully loads Crcdisk.sys and enters Safe mode the best thing to do is to check to see if there are any available patches or updates available which could resolve and Crcdisk.sys related errors.
The third possibility, that many people are reporting, that could cause a Crcdisk.sys error message is if the computer has multiple operating systems loaded on partitioned drives. Many times with multiple versions of an operating system loading at the same time there are miscommunications that occur and result in issues when starting up the system. It has even been suggested that Crcdisk.sys itself is not causing the errors when starting up, it just is the last driver that loads prior to the computer starting up and actually has no impact on the issues.
If this is the case and there are in fact multiple operating systems loaded the best thing to do is to try to get the system back into safe mode and load a restore point prior to any of the issues appearing.