From Alfred Hitchcock Wiki

DVD5 is a single-sided single-layer format DVD disc capable of storing up to 4.38GB of data.

The main DVD formats currently in use are:

• DVD5 (single-sided single-layer)
• DVD9 (single-sided dual-layer)
• DVD10 (two-sided single-layer)
• DVD14 (two-sided single/dual-layer)
• DVD18 (two-sided dual-layer)