SMB

What SMB means on a NAS

SMB stands for Server Message Block. It is a network protocol used to access shared files and folders from computers and other compatible devices.

On NAS products, SMB commonly appears in specifications such as “CIFS/SMB,” “SMB/CIFS,” or “Share folder: CIFS/SMB.” These entries indicate that the product supports SMB-based network sharing. The catalog also contains products listing specific versions or dialects, including SMB1, SMB2, SMB2.1, SMB3, and SMB3.0.

Why NASFit buyers should care

SMB is relevant when a NAS will provide shared folders to devices on a network. A product with SMB support may be suitable for environments where clients are expected to browse, read, or write files through a network share.

The label is especially useful when comparing NAS products intended for general file sharing. It can also help distinguish SMB from nearby protocols such as NFS, AFP, and FTP, which may be used by different clients or for different sharing workflows.

What the SMB label does not tell you

An SMB capability flag is not a quality rating. It does not, by itself, establish transfer speed, the number of simultaneous users, reliability, security configuration, or compatibility with every client.

A specification that says “SMB” also may not identify the supported SMB dialects. Where a product lists SMB1, SMB2, SMB2.1, SMB3, or SMB3.0, those details are more specific; where it only says “CIFS/SMB,” the supported versions and features remain unknown from that entry.

The observed catalog strings sometimes combine SMB with CIFS or include truncated protocol lists. Those entries should not be read as complete documentation of authentication, encryption, permissions, or other SMB behavior.

What to check on a product page

Look for:

• Whether SMB is listed under supported network protocols or shared-folder support
• Whether the product names supported SMB versions or dialects
• Whether the intended client operating systems and devices are addressed in the product documentation
• Whether separate details are provided for user permissions, authentication, security features, or concurrent access
• Whether SMB is included alongside other protocols you need, such as NFS, AFP, or FTP

When a page only shows a general SMB or CIFS/SMB flag, treat it as evidence of protocol support—not as proof of a particular implementation or performance level.

Nearby terms

CIFS is a name frequently shown alongside SMB in NAS specifications. NFS and AFP are other network file-sharing protocols, while FTP is commonly associated with file transfers rather than ordinary shared-folder access.