hddtemp

displays the temperature of hard disk drives via S

TLDR

Display temperature of a SATA drive

$ hddtemp SATA:/dev/sda

Display in Fahrenheit

$ hddtemp -u F SATA:/dev/sda

Display numeric value only

$ hddtemp -n SATA:/dev/sda

Log to syslog every N seconds

$ hddtemp -S 60 SATA:/dev/sda

Wake drive before reading temperature

$ hddtemp -w SATA:/dev/sda

Run in daemon mode

$ hddtemp -d SATA:/dev/sda

Show debug information

$ hddtemp -D SATA:/dev/sda

SYNOPSIS

hddtemp [options] [type]:device

hddtemp displays the temperature of hard disk drives via S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology). It can show temperature for SATA, PATA, and SCSI drives that support S.M.A.R.T.

PARAMETERS

-n, --numeric

Print only the numeric temperature value without units

-u, --unit=UNIT

Set temperature unit (C for Celsius, F for Fahrenheit)

-S, --syslog=SECONDS

Log temperatures to syslog every N seconds

-d, --daemon

Run as daemon (TCP/IP server mode)

-l, --listen=ADDR

Listen on specified address in daemon mode

-p, --port=PORT

Listen on specified port in daemon mode (default: 7634)

-w, --wake-up

Wake up the drive before reading temperature

-q, --quiet

Suppress drive type compatibility warnings

-D, --debug

Show S.M.A.R.T. fields and their values

-f, --file=FILE

Use specified drive database file

CAVEATS

Requires root privileges to access drive S.M.A.R.T. data. The drive type prefix (SATA, PATA, SCSI) is required for proper operation. Not all drives support temperature monitoring through S.M.A.R.T.

HISTORY

hddtemp was developed to provide simple temperature monitoring for hard drives using S.M.A.R.T. data, commonly used for system health monitoring.