Simplify access management, improve security, and reduce administrative overhead by assigning permissions at the top level rather than throughout an entire folder structure.
Introduction
Managing permissions on shared drives can become increasingly complex as businesses grow. Over time, it is common to find users, groups, and individual permissions assigned at multiple levels throughout a folder hierarchy.
This often results in:
- Confusing access rights
- Increased support calls
- Difficult auditing
- Security risks
- Excessive administration
One effective approach is the Two-Tier Permission Model, where permissions are assigned only at the shared drive level and the first level of business folders.
What Is a Two-Tier Permission Model?
A Two-Tier Permission Model uses two primary levels of access control:
Tier 1: Shared Drive Root
The shared drive itself is secured so that only authorised users can access it.
Example:
S:\
or
\\FileServer\Shared
Tier 2: Top-Level Business Folders
Permissions are assigned to the first level of folders within the share.
Example:
Shared
│
├── Finance
├── HR
├── IT
├── Sales
└── Marketing
Each department receives access only to its own folder.
Example Structure
\\FileServer\Shared
│
├── Finance
│ ├── Reports
│ ├── Budgets
│ └── Payroll
│
├── HR
│ ├── Recruitment
│ ├── Training
│ └── Personnel
│
├── IT
│ ├── Projects
│ ├── Documentation
│ └── Scripts
│
└── Sales
├── Customers
├── Quotes
└── Forecasts
In this model:
- Finance permissions are assigned to the Finance folder.
- HR permissions are assigned to the HR folder.
- IT permissions are assigned to the IT folder.
- Sales permissions are assigned to the Sales folder.
Subfolders inherit permissions automatically.
Permission Assignment Example
Shared Root
\\FileServer\Shared
Permissions:
| Group | Access |
|---|---|
| Domain Users | Read & Traverse |
| File Server Administrators | Full Control |
Users can see the share but only access folders they have permissions to.
Finance Folder
\\FileServer\Shared\FinanceShow more lines
Permissions:
| Group | Access |
|---|---|
| Finance_RW | Modify |
| Finance_RO | Read |
| File Server Administrators | Full Control |
HR Folder
\\FileServer\Shared\HR
Permissions:
| Group | Access |
|---|---|
| HR_RW | Modify |
| HR_RO | Read |
| File Server Administrators | Full Control |
Benefits of the Two-Tier Model
Simpler Administration
Permissions are assigned once at the department folder level.
Administrators avoid managing permissions deep within folder structures.
Easier troubleshooting.
Better Security
Permissions remain consistent throughout the folder structure.
This reduces the likelihood of:
- Accidental exposure
- Misconfigured inheritance
- Orphaned permissions
Easier Auditing
Auditors can quickly identify:
- Who has access
- Which groups are used
- Department ownership
without examining every subfolder individually.
Recommended Use of Security Groups
Avoid assigning permissions directly to users.
Poor Practice
John Smith – Modify
Jane Brown – Modify
David Jones – Read
Better Practice
Finance_RW
Finance_RO
HR_RW
HR_RO
Users are added to groups, and groups are granted permissions.
Benefits include:
✅ Easier management
✅ Better reporting
✅ Simpler user onboarding and offboarding
Best Practice Checklist
✅ Secure the share root
✅ Assign permissions at top-level folders
✅ Use Active Directory security groups
✅ Avoid direct user permissions
✅ Maintain inheritance wherever possible
✅ Keep the structure simple
✅ Regularly review group membership
✅ Document folder ownership
Key Takeaway
The Two-Tier Permission Model provides a simple, scalable, and secure approach to managing shared drive access. By restricting permission assignments to the shared drive root and top-level business folders, organisations can significantly reduce complexity while improving security, supportability, and auditability. For most departmental file shares, a well-designed two-tier model strikes an excellent balance between flexibility and administrative control.