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t2d dataio



t2d -- copy files from tape to disk quickly


t2d input ofroot


Tape file or device name, e.g. "mta1600[1]" or "mta"
List of tape file numbers or ranges delimited by commas, e.g. "1-3,5-8". `Files' is requested only if no file number is given in `input'. Files will be read in ascending order, regardless of the order of the list. Reading will terminate if EOT is reached, thus a list such as "1-999" may be used to read all the files on the tape.
Root name to give output files. A three digit sequence number will be appended to this root name for each file written if a file list is used. If the file number is specifically given in the input parameter, the output file will be named this root without an appended sequence number.
verbose = yes
Flag to signal program that it should produce verbose output. This means progress reports.
errignore = yes
Flag to signal program that tape records that give read errors should be considered to have zero length. If set to no, error records are considered to be the same length as all the other records on the tape.


T2d reads files from tape and puts them into disk files. No formating is performed so the bits and bytes are in the same order on disk as they were on tape. The program uses double buffering and asynchronous i/o to speed things up as much as possible.

When read errors are encountered one of two things can happen. Depending on the value of the parameter errignore, the error record is either thrown out or considered valid data. If errignore is no when an error is found, the input buffer is validated to the most recent good record length and written to disk. If errignore is yes when an error is found, the the input buffer is disposed of for that record.


1. To read the second image from mta at 1600 bpi, store the image into "image" and see verbose output the command would be:

	cl> t2d mta1600[2] image

2. To read all the files on mtb at the default speed of 1600 bpi and put the disk files in root001, root002, root003, etc. and turn off verbose output, the command would be:

	cl> t2d mtb root v-

The program will prompt the user and ask for the list of files to be read to which the response would be "1-999".



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