PART.8
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- PART(8) Minix Programmer's Manual PART(8)
- NAME
- part - partition table editor
- SYNOPSIS
- part [device] ...
- DESCRIPTION
- Part is a screen oriented partition table editor.
- While editing you will see six lines of numbers, the first line shows the
- device name and its geometry (number of cylinders, heads and sectors),
- the second shows the start and end of the drive or partition you are
- working on, the last four lines show the different partitions or
- subpartitions. All numbers except those on the second line can be
- edited. Question marks are showed instead of numbers if the partition
- table is not loaded yet. You have to select a device and type 'r'.
- Editing is a simple matter of moving around with the arrow keys and
- changing the values with + and - (or PgUp and PgDn), or by typing the
- desired value. The '?' key will give a small list of commands, the '!'
- key gives advice on how to make a new entry.
- The spacebar toggles between showing the size of the partition and the
- last sector on the partition. Useful to check if a partition is adjacent
- to the next.
- The 'm' key is "magical", it lets you cycle through a set of interesting
- values for the base or size of a partition. These values are: Aligned to
- a cylinder, taped to other partitions (inside or outside), or filling out
- holes. Use this key!
- Minix subpartition tables or extended partitions may be edited after
- hitting the '>' key. The number of this partition will be shown after
- the device name on the second row, e.g. /dev/hd0:2. Minix subpartition
- tables are shown as is, but extended partition bases are translated to
- absolute offsets on the screen to hide the gory details of their
- implementation from the innocent user. (Hit 'p' if you dare.) The '<'
- key will bring you back to the enclosing partition table.
- With arguments, part will use the given devices or files. Without
- arguments, part will use all interesting block devices in /dev sorted by
- device number and starting with /dev/hd0.
- Values that are out of range, overlapping, or otherwise strange are shown
- in reverse video. Values that may possibly be a problem for operating
- systems other then Minix are shown in bold characters.
- The name of the device is highlighted when it has not been read yet.
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- PART(8) Minix Programmer's Manual PART(8)
- Head or sector numbers are highlighted if the partition does not start or
- end at a cylinder boundary.
- The base and/or size field is highlighted if they fall outside the
- device, if they are inside some other partition, if the base equals the
- device's base (no room for the boot sector), or if the size is zero.
- Part complies with the good old UNIX tradition of trusting the user. It
- will write any table, no matter how bad. You have been warned.
- By the way, as far as Minix is concerned there is absolutely no reason to
- make partitions start precisely on a cylinder or track nor does it have
- to be an exact number of cylinders long. Minix only looks at the base
- and size of a partition, the geometry of the drive doesn't have to be
- correct. Other Operating systems can be very picky about partitions that
- are not aligned. Some partition editors may refuse to edit a table,
- others may even make a mess of the table. The only exception is the
- first partition, it traditionally starts on the first track, not the
- first cylinder. All editors must understand this. (Subpartition tables
- are Minix specific, so there is no reason at all for any alignment.)
- Extended Partitions
- Extended partitions are a mess that is only made slightly better by part
- by translating the base offsets to absolute numbers. It is better to use
- DOS fdisk to create them, but if you insist on using part then this is
- what they should look like:
- The extended partition entry in the primary partition table must
- cover the whole logical partition space within it.
- The area thus created is split in segments, each segment contains a
- partition table in sector 0 and one (just one) logical partition.
- The first entry of a segment's partition table describes this
- logical partition: it's partition ID, base and size.
- The second entry is an extended partition that describes base and
- size of the next segment (partition table and logical partition).
- The last segment's partition table is empty, or contains one logical
- partition.
- SEE ALSO
- fd(4), hd(4).
- BUGS
- You can have a table read, messed up, and written in no time, be careful.
- You can't type head or sector numbers directly.
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- PART(8) Minix Programmer's Manual PART(8)
- Sectors are counted from 0 for consistency, but the partition table
- counts from 1 like DOS addresses them. Most confusing.
- You can't write a backup copy to a file, that's what dd(1) with count=1
- is for.
- AUTHOR
- Kees J. Bot (kjb@cs.vu.nl)
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