USB Storage Control Block All Devices or Allow a Trusted List
"Just block all pen drives" sounds simple — until the bank dongle, the plotter and the director's presentation drive all stop working on the same morning. USB control in ManageEngine Endpoint Central is not one switch. It is a choice of postures, per department, with a trusted list for the devices the office genuinely owns.
🎥 Watch the full DLP setup in the video — every policy screen, step by step
Ask ten offices how they handle pen drives and you get two answers: everything blocked (and staff quietly working around it) or everything allowed (and data quietly walking out). Both are failures. Endpoint Central's Device Control gives you four postures — audit only, allow within trusted devices, block with permission to override, and full block. This page helps you pick the right one, per team, and run the exception register that keeps the policy honest.
Device Control — The Four Postures (Endpoint DLP Plus levels)
Audit onlyAllowed, everything logged
Allow within trusted devicesListed devices work, rest blocked
Block with permission to overrideUser justifies, admin reviews
BlockAll devices stopped
The four permission levels are ManageEngine's documented model. Names on your console can vary slightly by product and build.
1
Block All — When the Nuclear Option Is Right
A full block is correct where the data is worth more than the convenience: accounts and salary systems, HR computers, servers, and shared reception PCs. On these machines no one's personal storage should ever mount.
Apply the block by computer group, not by hoping users behave
Keep the keyboard, mouse and office printer working — device control separates device types, so storage can be blocked while everyday peripherals stay
Expect the first-week complaints and answer them with the exception route below, not by quietly removing the policy
2
Allow a Trusted List — the Working Middle Path
Most departments land here. The office's own pen drives and external disks are registered once; anything else that gets plugged in is refused.
Register each device by its unique identity, and label it in the console with owner and purpose — Accounts backup drive, not USB 32GB
Prefer read-only access where the job only needs files read from the device — installs and incoming files rarely need write access to your PC's data in reverse
Use wildcard bulk addition carefully: trusting every device from one vendor is a wide door wearing a narrow name
3
The Exception Register — Paper That Protects the Policy
Every block creates exceptions. The only question is whether they are recorded or whispered. Keep a simple register — a shared sheet is enough — with these columns:
Date and who asked
Device and business reason
Approved by whom, and for how long
Expiry date — exceptions without expiry become permanent holes
4
Review the Trusted List Like a Visitor Register
A trusted list only shrinks in value over time. Devices get lost, staff leave, vendors change.
Monthly: remove devices whose owner has left or whose purpose has ended
After any lost-device report, remove that device the same day — first, questions later
Quarterly: read the file tracing report for trusted devices too. Trusted means allowed, not invisible
🎥 Watch the Complete Setup in the Video
See the trusted list and device policies being built on screen in the full video.
Can we block pen drives but allow USB printers and scanners?
Yes. Device Control separates peripheral types — storage, printers, imaging devices, Bluetooth and more are controlled independently. Blocking storage while printers keep working is the normal office setup.
What happens when someone plugs in an unknown pen drive?
It depends on the posture you set: in audit mode it works but is logged; with a trusted-list policy it is blocked; in the override mode the user can request access with a justification, which is logged for you to review.
Is read-only USB access a real option?
Yes. Role-based file access in Device Control includes read-only permission for authorised devices. It suits machines that must read incoming files — for example site data or vendor media — without ever letting office data be written out.
This guide is based on the ManageEngine DLP video by Technical Anshu • Stuck on a step? Ask in the video comments — answers happen there.