-
-.PP
-Hardware compression is detected by measuring the writing speed difference of the tape drive when writing an amount of compressable and uncompresseable data\&. It does not rely on the status bits of the tape drive or the OS parameters\&. If your tape drive has very large buffers or is very fast, the program could fail to detect hardware compression status reliably\&.
-
-.PP
-During the first pass, it writes files that are estimated to be 1% of the expected tape capacity\&. It gets the expected capacity from the \-e command line flag, or defaults to 1 GByte\&. In a perfect world (which means there is zero chance of this happening with tapes :\-), there would be 100 files and 100 file marks\&.
-
-.PP
-During the second pass, the file size is cut in half\&. In that same fairyland world, this means 200 files and 200 file marks\&.
-
-.PP
-In both passes the total amount of data written is summed as well as the number of file marks written\&. At the end of the second pass, quoting from the code:
-
-.PP
-* Compute the size of a filemark as the difference in data written between pass 1 and pass 2 divided by the difference in number of file marks written between pass 1 and pass 2\&. \&.\&.\&. *
-