The available storage space reported by the host file system is indicated in this field. A value of -1 indicates that the amount could not be determined for the selected volume.

The amount of storage space used on the volume is indicated in this field. A value of 0 can indicate that usage could not be determined for the selected volume.

Please note that storage usage is typically measured in terms of blocks. For instance, a block size of 512 bytes will mean that this field is a multiple of 512. Two files of 1 byte each on such a file system would take up 1024 bytes of space and not 2.

If a volume exposes a unique device identifier such as a factory serial number, it will be readable from this field. The field is empty when the selected volume or file system driver does not provide an identifier.

This field indicates the total byte capacity reported by the host file system for the selected volume. It does not reflect the remaining writable space; use BytesFree for that value. A value of -1 indicates that capacity could not be determined.

Set the Volume field prior to initialisation so that the object can query the selected volume. The standard volume string format is name:, but omitting the colon or defining complete file system paths when writing this field is also acceptable. Any characters following a colon are stripped automatically, and the stored value is normalised to include the trailing colon.