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Returns free space on disk volume holding specified file or directory.
| Number | Type | Compulsory | Default | Description | 
|---|---|---|---|---|
| 1 | string | Yes | 
 | Directory | 
A file or directory that resides on the disk volume whose free space is required. On windows this may be simply the drive letter followed by a colon. E.g. 'C:'
Return type: real
Free space available in bytes
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