Batch file set wmi output as a variable

You want:

for /f %%a in ('wmic diskdrive get size^|findstr [0-9]') do echo %%a

For usage in batch file. From command line, replace %% with %

for /f "tokens=*" %%f in ('wmic diskdrive get size /value ^| find "="') do set "%%f"
echo %size%

Or, if you want to use you prefered variable

for /f "tokens=2 delims==" %%f in ('wmic diskdrive get size /value ^| find "="') do set "myVar=%%f"
echo %myVar%

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