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Novell, Inc.'s term for the feature of their network file server operating system, Novell NetWare, which handles errors in disk write operations. The OS re-reads every block it writes to disk while it holds the data to be written in memory. In the case of an error, the data block is written to a spare area on the disk.
The feature lost much of its importance with the widespread use of hard disk drives with built-in error correction and bad block re-mapping.