CLI Change drive Post: 302583822

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Operating Systems Linux Ubuntu CLI Change drive Post 302583822 by Corona688 on Wednesday 21st of December 2011 10:14:41 AM

12-21-2011

Registered User

Quote:

Originally Posted by Royalist

Please -- I cannot find how to change in terminal from e.g. sda1 to sda2 or to sdb*

UNIX partitions don't work that way. You don't use drive letters or device names to access files. In UNIX, files are all organized as one great big tree. Instead of drive letters, UNIX uses directories as mount points. This lets you put partitions on whatever folder you want. This is even customizable.

This is what the file tree on my system looks like:

Code:

$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sdc3            1008M  318M  639M  34% /
udev                   10M  284K  9.8M   3% /dev
/dev/sdc5              20G   11G  8.4G  56% /home
/dev/sdc6             9.9G  4.6G  4.9G  49% /usr
/dev/sdc7             5.6G  1.6G  3.9G  29% /var
/dev/sdc8             116G  5.1G  111G   5% /var/lib/mysql
shm                   948M     0  948M   0% /dev/shm
/dev/md125            394G  351G   24G  94% /opt
/dev/md126            1.5T  1.4T  106G  93% /opt/disk-images
$

'udev' and 'shm' are special kernel filesystems which you can ignore for now.

If I created a file inside /, or /tmp/, or /sbin/, or /etc/ -- nowhere inside any of the other folders listed -- the file would end up inside /dev/sdc3.

If I created a file in /home/username/, it would end up in /dev/sdc5.

My /var/ partition ended up not being large enough to hold our database, so I grafted another partition onto /var/lib/mysql for it to work inside.

Which partitions go where is traditionally controlled by lines in the /etc/fstab file, but various systems may handle it different ways.

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LEARN ABOUT BSD

rxformat

RXFORMAT(8)						      System Manager's Manual						       RXFORMAT(8)

NAME

       rxformat - format floppy disks (2.11BSD)

SYNOPSIS

       rxformat special

DESCRIPTION

       The rxformat program formats a diskette in the specified drive associated with the special device special.  Special is normally /dev/rrx0?,
       for drive 0, or /dev/rrx1?, for drive 1, where ``?'' is either "a" or "b" to indicate single or double density access.  The ``raw''  device
       must  be  used.	 Single  density is compatible with the IBM 3740 standard (128 bytes/sector).  In double density, each sector contains 256
       bytes of data.

       Before formatting a diskette rxformat prompts for verification if standard input is a tty (this allows a user to cleanly abort  the  opera-
       tion; note that formatting a diskette will destroy any existing data).  Formatting is done by the hardware.  All sectors are zero-filled.

DIAGNOSTICS

       `No  such  device'  means that the drive is not ready, usually because no disk is in the drive or the drive door is open.  Other error mes-
       sages are selfexplanatory.

FILES

       /dev/rrx??

SEE ALSO

       rx(4)

AUTHOR

       Helge Skrivervik

BUGS

       A floppy may not be formatted if the header info on sector 1, track 0 has been damaged.	Hence, it is not possible to format  a	completely
       degaussed disk.	(This is actually a problem in the hardware.)

3rd Berkeley Distribution					 November 17, 1996						       RXFORMAT(8)