You cannot block SD card with built-in definition. This is what you need to do
New Definition/Rule Set for SD Card RO/BLOCK or whatever you choose
Create new Definitions under Removale Devices or duplicate "SD Card readers (windows) [built-in]" definitions Rename or name as "SD Card RO or BLOCK" Click edit and select Device Instance ID (Advanced) Create 3 Comparisons with "Contain" and "Value" SD/RIMMPTSK/PCISTOR Save it
Now go to DLP Rule Set
Under Rule Sets Create new rule, fill all your requirements then under Removable Storage click to select newly created "SD Card RO/BLOCK" definitions OK and save
Assign to a policy and send WAU and you should be fine
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