disc input output error mac disk image utility

Otherwise,Įxisting blocks are read and the data discarded. On non-tape devices, an lseek(2) operation is used. Seek= n Seek n blocks from the beginning of the output before copying. Oseek= n Seek on the output file n blocks. Seeked past (see the oseek operand), the output file is truncated If an initial portion of the output file is Output file is truncated unless the notrunc conversion value Of= file Write output to file instead of the standard output. Obs= n Set the output block size to n bytes instead of the default 512. Iseek= n Seek on the input file n blocks. If= file Read input from file instead of the standard input. Ibs= n Set the input block size to n bytes instead of the default 512. This operand is onlyĪpplicable when the input device is a tape. Record size is required by the record oriented conversion values.įiles= n Copy n input files before terminating. Noerror, notrunc or sync are specified, then each input block isĬopied to the output as a single block without any aggregationĬbs= n Set the conversion record size to n bytes. When finished, dd displays the number ofĬomplete and partial input and output blocks and truncated input records toīs= n Set both input and output block size to n bytes, superseding the

If input reads are short, input from multiple reads areĪggregated to form the output block.

Data Duplicator, convert and copy a file.Ĭopy standard input to the standard output.

Disc input output error mac disk image utility