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df MAN Page (647 words) |
 | With no arguments, `df' reports the space used and available on all currently mounted filesystems (of all types). |
| This may make `df' run significantly faster on systems with many disks, but on some systems (notably SunOS) the results may be slightly out of date. |
| GNU `df' does not attempt to determine the disk usage on unmounted filesystems, because on most kinds of systems doing so requires extremely nonportable intimate knowledge of filesystem structures. |
| Military communications and DF Raptor (2545 words) |
| DF Raptor is a packet-level erasure code, protecting against the loss of packets that may occur in transmitting data across a packet-switched network. |
| For example, DF Raptor's fountain characteristic allows DF Raptor-encoded symbols to be continually generated and transmitted until enough have been received to fully recover the original data, at which time the receiver can transmit an acknowledgment to the sender requesting that transmission cease or that the next source block be transmitted. |
| DF Raptor provides the means to deliver perishable data efficiently and reliably, either as a complete data file or as a real-time data stream. |
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