From Bitdefender Total Security User's Guide, Publication date 05/12/2019, on page 74 of bitdefender_ts_2019_userguide_en.pdf:
4.1.1. On-access scanning (real-time protection)
Bitdefender provides real-time protection against a wide range of threats by scanning all accessed files and email messages.
From page 73:
Bitdefender automatically scans any removable media that is connected
to the computer to make sure it can be safely accessed. For more
information, refer to “Automatic scan of removable media” (p. 86).
From page 86:
4.1.3. Automatic scan of removable media
Bitdefender automatically detects when you connect a removable storage device to your computer
and scans it in the background when the Autoscan option is enabled.
This is recommended to prevent threats from infecting your computer.
Detected devices fall into one of these categories:
drives, such as flash pens and external hard-drives
● mapped (remote)
Continued on next page:
You can configure automatic scan separately for each category of
storage devices. Automatic scan of mapped network drives is off by