Manualshelf

Installation guide

ManualsBrandsPythonQ ManualsIndustrial248-8XX
41424344454647484950
Chapter 2. The proc File System 41
2.3.5. /proc/ide/
This directory holds information about IDE devices on the system. Each IDE channel is represented
as a separate directory, such as /proc/ide/ide0 and /proc/ide/ide1. In addition, a drivers
file is also available, providing the version number of the various drivers used on the IDE channels:
ide-cdrom version 4.59
ide-floppy version 0.97
ide-disk version 1.10
Many chipsets also provide an informational file in this directory that gives additional data concerning
the drives connected through the the channels. For example, a generic Intel PIIX4 Ultra 33 chipset
produces a /proc/ide/piix that will tell you whether DMA or UDMA is enabled for the devices
on the IDE channels:
Intel PIIX4 Ultra 33 Chipset.
------------- Primary Channel ---------------- Secondary Channel -------------
enabled enabled
------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------
DMA enabled: yes no yes no
UDMA enabled: yes no no no
UDMA enabled: 2 X X X
UDMA
DMA
PIO
Navigating into the directory for an IDE channel, such as ide0, provides additional information. The
channel file provides the channel number, while the model tells you the bus type for the channel
(such as pci).
2.3.5.1. The Device Directory
Within each IDE channel directory is a device directory. The name of the device directory corresponds
to the drive letter in the /dev/ directory. For instance the first IDE drive on ide0 would be hda.
Note
There is a symlink to each of these device directories in the /proc/ide/ directory.
Each device directory contains a collection of information and statistics. The contents of these direc-
tories vary according to the type of device connected. Some of the more useful files common to many
devices include:
• cache — The device’s cache.
• capacity — The capacity of the device, in 512 byte blocks.
• driver — The driver and version used to control the device.
• geometry — The physical and logical geometry of the device.
• media — The type of device, such as a disk.