# HDF Reference Manual

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> ### VF - Vdata Field Interface

> | VFfieldesize/vffesiz | Returns the size, as stored on disk, of a vdata field.
> | VFfieldisize/vffisiz | Returns the size, as stored in memory, of a vdata field.
> | VFfieldname/vffname | Returns the name of a vdata field.
> | VFfieldorder/vffordr | Returns the order of a vdata field.
> | VFfieldtype/vfftype | Returns the data type of a vdata field.
> | VFnfields/vfnflds | Returns the total number of fields in a vdata.

> ###

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