Thanks for the information. However, it would have been more helpful if you had posted the URL instead of making everyone search for it.
Anyway, here is one link that I found:
The ZIP contains the following instructions:
“How To Install Windows OS on WD Solid State Hybrid Drive1_3.pdf”
It also contains 32-bit and 64-bit versions of WdHybrid.exe which is a diagnostic/reporting tool (not a driver).
ISTM you could determine the NAND flash capacity by typing …
WdHybrid -d? (lists the drives found)
WdHybrid -status -dn (reports the NAND flash MiB capacity for drive n)
WdHybrid -test4 -dn (performs full SSD read verify test)
Here is the readme.txt:
Windows console tool to enable or disable the SSD LBA reporting on a WD bridged hybrid drive. It can also test and display the LBA values corresponding to the HDD and SSD.
Changes in version 1.6:
* -d? option ignores external USB drives in the list of drives found.
* -status option reports the NAND flash MiB capacity for WD SSHD drives with 02.XXXXX firmware.
WdHybrid [-enable|-disable|-status|-test<n>|-d?] [-d<n>] [-?]
-d? List the drives found
-d<n> Select drive number <n> (default is 0)
-enable Enable SSD reporting
-disable Disable SSD reporting
-status Show if SSD is enabled or disabled and LBA values
-test1 HDD SMART DST short
-test2 HDD SMART DST long
-test3 HDD SMART DST conveyance
-test4 Full SSD read verify test (256 sectors at a time)
-? This help message
If no arguments are given, it defaults to -status
0 - Pass
1 - Fail
WDHybrid v1.6 may not report a read scan error on the SSD with AMD drivers 126.96.36.1997 and prior. For AMD systems, AMD driver 188.8.131.52 and Microsoft inbox drivers will properly report SSD read scan errors.