10-07-2015
Cannot find logical file format for BSD file headers.
Hi. Unix rookie here. Been looking for a few days for reference documents on how BSD UNIX lays the logical file format onto a disk. Goal is to view/edit with hex editor for data repair. Lots of docs are available for how to use Unix commands (like xxd), but I want to learn the map of how Unix stores the file header and file data and cluster information on the hard disk. I've asked on a few forums and emailed companies (like R-tt regarding R-Studio for Mac) and have no answer yet. Anyone know where I can read about this?
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TAPEFS(1) General Commands Manual TAPEFS(1)
NAME
32vfs, cpiofs, tapfs, tarfs, tpfs, v6fs, v10fs - mount archival file systems
SYNOPSIS
fs/32vfs [ -m mountpoint ] [ -p passwd ] [ -g group ] file
fs/cpiofs
fs/tapfs
fs/tarfs
fs/tpfs
fs/v6fs
fs/v10fs
DESCRIPTION
These commands interpret data from traditional tape or file system formats stored in file, and mount their contents (read-only) into a Plan
9 file system. The optional -p and -g flags specify Unix-format password (respectively group) files that give the mapping between the
numeric user- and group-ID numbers on the media and the strings reported by Plan 9 status inquiries. The -m flag introduces the name at
which the new file system should be attached; the default is /n/tapefs.
32vfs interprets raw disk images of 32V systems, which are ca. 1978 research Unix systems for the VAX, and also pre-FFS Berkeley VAX sys-
tems (1KB block size).
Cpiofs interprets cpio tape images (constructed with cpio's c flag).
Tarfs interprets tar tape images.
Tpfs interprets tp tapes from the Fifth through Seventh Edition research Unix systems.
Tapfs interprets tap tapes from the pre-Fifth Edition era.
V6fs interprets disk images from the Fifth and Sixth edition research Unix systems (512B block size).
V10fs interprets disk images from the Tenth Edition research Unix systems (4KB block size).
SOURCE
These commands are constructed in a highly stereotyped way using the files fs.c and util.c in /sys/src/cmd/tapefs, which in turn derive
substantially from ramfs(4).
SEE ALSO
Section 5 passim, ramfs(4).
TAPEFS(1)