They’re just not enough!
Blocked USB ports don't actually prevent data theft, they just seal off one of the many modes of data loss. The entire process of blocking USB ports is pointless if any disgruntled employee can export sensitive data via email, burn files to a CD/DVD, or transfer files during remote access. Thieves can even download data from the cloud.
They’re too limiting.
A permanently closed door is no door at all, and does no good. Blocking USB ports indiscriminately prohibits the use of necessary devices such as mobile phones, cameras, wireless networking devices like modems, and fingerprint scanners, which affects employee morale and even stifles employee productivity. With simple data transfers becoming complex due to blocked USB ports, employees might resort to the use of shadow IT.*
Fifty percent of the global workforce will be mobile by 2020. With organizations adopting bring your own device (BYOD) policies at record rates, a data loss prevention solution that does not impede growth and productivity for the sake of security is critical. Blocking USB ports makes the implementation of BYOD in the workplace difficult and arduous.
In short, USB blocking is a crude and rudimentary solution to a complex information security crisis. Organizations need a wholesome security solution that can prevent data loss without compromising productivity.