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I need to know what hard disks are available, including ones that aren't mounted and possibly aren't formatted. I can't find them in dmesg or /var/log/messages (too much to scroll through). I'm hoping there's a way to use /dev or /proc to find out this information, but I don't know how. I am using Linux.

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The original question didn't specify any particular unix variant, and hardware management is obviously highly variant-dependent. –  Gilles Dec 6 '10 at 18:51
    
@gilles yeah I was at work when I wrote it, so I clarified after I got home and thought about it. –  xenoterracide Dec 7 '10 at 1:11
1  
Depending on what you're doing, udisks. –  derobert Oct 3 '12 at 17:06

18 Answers 18

up vote 56 down vote accepted

This is highly platform-dependent. Also different methods may treat edge cases differently (“fake” disks of various kinds, RAID volumes, …).

On modern udev installations, there are symbolic links to storage media in subdirectories of /dev/disk, that let you look up a disk or a partition by serial number (/dev/disk/by-id/), by UUID (/dev/disk/by-uuid), by filesystem label (/dev/disk/by-label/) or by hardware connectivity (/dev/disk/by-path/).

Under Linux 2.6, each disk and disk-like device has an entry in /sys/block. Under Linux since the dawn of time, disks and partitions are listed in /proc/partitions. Alternatively, you can use lshw: lshw -class disk.

If you have an fdisk or disklabel utility, it might be able to tell you what devices it's able to work on.

You will find utility names for many unix variants on the Rosetta Stone for Unix, in particular the “list hardware configuration” and “read a disk label” lines.

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2  
Ooo; that Rosetta Stone site is excellent –  Michael Mrozek Dec 6 '10 at 15:22

How about

lshw -class disk
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not bad... I'll double check it when I get off, I'm sure it works... unfortunately it's (lshw) not installed on the server, and I suspect the answer will be we're not installing it. –  xenoterracide Dec 6 '10 at 8:23
    
For some reason, lshw does not list hard disks. –  GromBeestje Nov 6 '13 at 0:44
    
When not run as root, it lists no disks, but also gives no error. –  Volker Siegel Jul 1 at 11:26

hwinfo helps:

> hwinfo --disk
21: IDE 00.0: 10600 Disk                                        
[Created at block.245]
Unique ID: 3OOL.8MZXfAWnuH8
Parent ID: w7Y8.1T_0outZkp6
SysFS ID: /class/block/sda
SysFS BusID: 0:0:0:0
SysFS Device Link: /devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0
Hardware Class: disk
Model: "Hitachi HTS54322"
Vendor: "Hitachi"
Device: "HTS54322"
Revision: "ESBO"
Driver: "ahci", "sd"
Driver Modules: "ahci"
Device File: /dev/sda
Device Files: /dev/sda, /dev/disk/by-id/ata-Hitachi_HTS543225A7A384_E2021342GEPG4J, /dev/disk/by-id/scsi-SATA_Hitachi_HTS5432_E2021342GEPG4J, /dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0, /dev/disk/by-id/wwn-0x5000cca614c6395e
Device Number: block 8:0-8:15
BIOS id: 0x80
Geometry (BIOS EDD): CHS 484521/16/63
Size (BIOS EDD): 488397168 sectors
Geometry (BIOS Legacy): CHS 1023/255/63
Drive status: no medium
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #17 (SATA controller)
> hwinfo --block --short
disk:                                                           
  /dev/sda             Hitachi HTS54322
partition:
  /dev/sda1            Partition
  /dev/sda2            Partition
  /dev/sda3            Partition
  /dev/sda4            Partition
  /dev/sda5            Partition
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@Giles says this is highly platform-dependent. Here's one such example.

I'm running a CentOS 5.5 system. This system has 4 disks and a 3ware RAID controller.

In my case, lshw -class disk, cat /proc/scsi/scsi and parted --list shows the RAID controller (3ware 9650SE-4LP). This doesn't show the actual disks:

only shows the 3ware RAID controller which provides the /dev/sda volume:

# lshw -class disk
  *-disk                  
       description: SCSI Disk
       product: 9650SE-4LP DISK
       vendor: AMCC
       physical id: 0.0.0
       bus info: scsi@0:0.0.0
       logical name: /dev/sda

# cat /proc/scsi/scsi 
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: AMCC     Model: 9650SE-4LP DISK  Rev: 4.06
  Type:   Direct-Access                    ANSI SCSI revision: 05

# parted --list

Model: AMCC 9650SE-4LP DISK (scsi)
Disk /dev/sda: 2000GB

In order to see the disks which lie underneath, I had to install the tw_cli utility from 3ware, and ask the controller itself.

# tw_cli info c0
...

VPort Status         Unit Size      Type  Phy Encl-Slot    Model
------------------------------------------------------------------------------
p0    OK             u0   931.51 GB SATA  0   -            WDC WD1002FBYS-02A6 
p1    OK             u0   931.51 GB SATA  1   -            WDC WD1002FBYS-02A6 
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lsblk will list all block devices. It lends itself well to scripting:

$ lsblk -io KNAME,TYPE,SIZE,MODEL
KNAME TYPE   SIZE MODEL
sda   disk 149.1G TOSHIBA MK1637GS
sda1  part  23.3G 
sda2  part    28G 
sda3  part  93.6G 
sda4  part   4.3G 
sr0   rom   1024M CD/DVDW TS-L632M

lsblk is present in util-linux package and is thus far more universal than proposed alternatives.

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I'm running fedora 14 and lshw is not available here (at least not by default). However in my case, I used fdisk -l command (as a root user) to get the following output:

Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders, total 16777216 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006a697

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1026047      512000   83  Linux
/dev/sda2         1026048    16777215     7875584   8e  Linux LVM

Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders, total 16777216 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table

Disk /dev/dm-0: 6509 MB, 6509559808 bytes
255 heads, 63 sectors/track, 791 cylinders, total 12713984 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/dm-0 doesn't contain a valid partition table

Disk /dev/dm-1: 1543 MB, 1543503872 bytes
255 heads, 63 sectors/track, 187 cylinders, total 3014656 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/dm-1 doesn't contain a valid partition table
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Use fdisk -l /dev/sd? or fdisk -l /dev/hd? to avoid bring in dm devices. –  laebshade Feb 11 '12 at 23:23

Since both "Can I see what HDD I have installed?" and "How do I determine the make & model of my storage devices?" are marked as duplicates of this question, I'm surprised no-one mentioned hdparm and smartctl. Having a look at a few machines, seems that either of them (when it's not both) is often found already installed in standard (even old) linux distributions.

# smartctl -i /dev/sda
smartctl 6.1 2013-03-16 r3800 [i686-linux-3.9.9-301.fc19.i686.PAE] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Toshiba 2.5" HDD MK..56GSY
Device Model:     TOSHIBA MK1656GSY
Serial Number:    60PKT43CT
LU WWN Device Id: 5 000039 2919874b6
Firmware Version: LH013D
User Capacity:    160 041 885 696 bytes [160 GB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS (minor revision not indicated)
SATA Version is:  SATA 2.6, 3.0 Gb/s
Local Time is:    Mon Jul 22 11:13:37 2013 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

# hdparm -i /dev/sda

/dev/sda:

 Model=TOSHIBA MK1656GSY, FwRev=LH013D, SerialNo=60PKT43CT
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=16384kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=312581808
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=yes: unknown setting WriteCache=enabled
 Drive conforms to: Unspecified:  ATA/ATAPI-3,4,5,6,7

 * signifies the current active mode

As usual, check manpage for more options.

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It should be noted that the smartctl way even works on Cygwin, +1! Just loop over possible device names and see if smartctl returns that the drive supports SMART. –  Adrian Frühwirth Sep 12 '13 at 12:35

Many of the commands listed will help you look for disks that have already been recognized by the system at boot. With modern drives, you may find yourself looking for something that you inserted while the machine was up and running (I did). I like the advice from http://fredericiana.com/2010/06/15/hot-plugging-a-sata-drive-under-linux/:

Try this to rescan the SCSI hosts (each SATA port appears as a SCSI bus):

echo "0 0 0" >/sys/class/scsi_host/host/scan

...Then you can use your Linux utilities like fdisk to show you information about the disks that were found.

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lshw is provided by lshw-* package.

yum install lshw* 

Running above command as a root will install the package.

lshw -class disk will work now.

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lshw has already been mentioned. –  Mat Nov 20 '12 at 11:56

This worked for me:

fdisk -l 2>/dev/null | grep "Disk \/" | grep -v "\/dev\/md" | awk '{print $2}' | sed -e 's/://g'
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If you do a

'more /etc/mtab'

you will see what the system has currently mounted with all the mount attributes. This file is maintained by the kernel with help from "/etc/fstab" and the autofs.

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sfdisk -l

will give you detailed info about hardware/physical disks even if they are not mounted.

the program is pre-installed on all Linux variants that I have used, but you have to be root to use it.

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df -h will list mounted drives, mount points, free space, and disk usage.

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Run as root following: fdisk -l -> for particular device:

fdisk /dev/sda

Then select p to see all partition on that device. To retrieve the information about the device:

smartctl -i /dev/sda
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dmesg can be used as a more universal option. It's much more manual, and much harder to read on modern linux kernels, but all the disks the kernel sees will be there. And it works on all UNIXes that I can think of.

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if you are using SUSE, yast can do the job for you.

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FILE *fp = popen("fdisk -l | grep \"Disk /\" | awk '{print $2};' | sed 's/://'", "r");
while(fgets(path, sizeof(path) -1,fp) != NULL)
//some code

pclose(fp);
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To return the number of block devices, without fancy tools nor obscure syntax or parameters:

 ls /sys/block/* | grep block | grep sd | wc -l

In my local test cases, 47 on my biggest war-machine and 1 on my laptop.

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This is off by 500% on one of my systems (Ubuntu 12.04) and by 200% on another system. –  Anthon Apr 7 at 12:03

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