Hybrid Information Read-Write Test (LOGO)

This test validates the behavior of reads and writes to the drive with priority. There are several test cases that the drive must pass:

  • Being able to read and write to each priority for most of the priority

  • Ensuring that the optimal write granularity is being properly reported in the hybrid log

  • Ensuring that priority updates are updated

  • Ensuring that the replacement policy in the cache is sensible

Test details

Associated requirements


See the device hardware requirements.


Windows 8.1 x64 Windows 8.1 x86

Expected run time

~240 minutes


Certification Functional




Running the test

Before you run the test, complete the test setup as described in the test requirements: Hard Disk Drive Testing Prerequisites.


For troubleshooting information, see Troubleshooting Device.Storage Testing.

Hybridflt.sys must be installed for this test to work properly.

More information

The test should automatically turn the hybrid information on before checking the logs if it was not on already.

This test relies on some behavior of hybrids that are not tested in this particular test or in some test cases. Ensure that dirty data thresholds are respected.

You can use the Command Syntax section to execute a specific test case.




The logging level for the test where 0 is least verbose and 4 is most verbose. You should leave this at its default value unless you need to troubleshoot individual test cases.

Default value: 1


Command syntax


Hybriddrive.exe –drive <disk #> -scenario logrw

Runs the test.

-Drive <disk#>

The drive to be tested on. The behavior of boot drives or drives with a file system is not defined.


The logging level for this test.


Displays help.

-Scenario logrw

The scenario to run.

-case #

The test case to run.




Send comments about this topic to Microsoft