The Ftape Installation and Usage Guide - Devices description
devfs file system
The Linux kernel (since version 2.3.46) contains support for a virtual
file system called devfs which serves to auto-magically create
device nodes under `/dev/' as needed. If the kernel supports
devfs then ftape-4.04 registers a directory `/dev/ftape/'
and subdirectories `/dev/ftape/0/', `/dev/ftape/1/',
`/dev/ftape/2/' and `/dev/ftape/3/'.
Using this naming scheme, `/dev/qft0' becomes
`/dev/ftape/0/mt', `/dev/zqft0' becomes
`/dev/ftape/0/mtz' and finally `/dev/rawft0' becomes
`/dev/ftape/0/mtr'. Non rewinding devices are indicated by the
suffix n instead of the prefix n, so
`/dev/nzqft2' maps to `/dev/ftape/2/mtzn'.
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