1HDDTEMP(8) System Manager's Manual HDDTEMP(8)
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6 hddtemp - Utility to monitor hard drive temperature
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9 hddtemp [options] [type:]disk...
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12 hddtemp will give you the temperature of your hard drive by reading
13 Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.) infor‐
14 mation on drives that support this feature. Only modern hard drives
15 have a temperature sensor. hddtemp supports reading S.M.A.R.T. infor‐
16 mation from SCSI drives too. hddtemp can work as simple command line
17 tool or as a daemon.
18 You can specify one or more device drive path, where each path can be
20 prefixed with a type like PATA, SATA or SCSI to force hddtemp too use
21 one of these type (because detection can fail).
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26 The program follows the usual GNU command line syntax, with long
27 options starting with two dashes (`-'). A summary of options is
28 included below.
29 -b, --drivebase
31 Display the database file that allows hddtemp to recognize a
32 supported drive.
33 -D, --debug
35 Display various S.M.A.R.T. fields and their values. Useful for
36 finding a value that seems to match the temperature and/or to
37 send a report. (done for every drive supplied)
38 -d, --daemon
40 Execute hddtemp in TCP/IP daemon mode (port 7634 by default).
41 -f, --file=file
43 Specify the database file to use.
44 -F, --foreground
46 Don't fork into the background even in daemon mode. This is
47 useful when running under a process supervisor.
48 -l, --listen=addr
50 Listen on a specific address. addr is a string containing a
51 host name or a numeric host address string. The numeric host
52 address string is a dotted-decimal IPv4 address or an IPv6 hex
53 address.
54 -n, --numeric
56 Print only the temperature (without the unit).
57 -p, --port=#
59 Port number to listen to (in TCP/IP daemon mode).
60 -s, --separator=char
62 Separator to use between fields (in TCP/IP daemon mode). The
63 default separator is `|'.
64 -S, --syslog=s
66 Switch to daemon mode and log temperatures to syslog every s
67 seconds.
68 -q, --quiet
70 Don't check if the drive is supported.
71 -u, --units=C|F
73 Force output temperature either in Celsius or Fahrenheit.0
74 -v, --version
76 Display hddtemp version number.
77 -w, --wake-up
79 Wake-up the drive if needed (ATA drives only).
80 -4 Listen on IPv4 sockets only.
82 -6 Listen on IPv6 sockets only.
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88 If you know your drive has a temperature sensor but it is being
89 reported unsupported, tell me which model and which manufacturer it is,
90 and/or just add a new entry in /usr/share/misc/hddtemp.db. Each line
91 of hddtemp.db is either a comment, a blank line or a line containing:
92 - a regular expression that allow hddtemp to recognize a drive or a
94 set of drives from its model name or from a generic model name,
95 - a value (ATTRIBUTE_ID from S.M.A.R.T.),
97 - a C or an F to set the unit to Celsius or Fahrenheit,
99 - a description.
101 Feedback is welcome (see the REPORT section below).
103
106 Example of type forcing:
107 # hddtemp SATA:/dev/sda PATA:/dev/hda
109 To test hddtemp in daemon mode, start it like this:
111 # hddtemp -d /dev/hd[abcd]
113 and use telnet or netcat (which is known as nc on some systems) to get
115 a reply:
116 # netcat localhost 7634
118 The drive database is read only once at startup, so hddtemp must be
120 restarted if the database is updated for the changes to take effect.
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124 As I receive a lot of reports, things must be clarified. When running
125 hddtemp with debug options, hddtemp will show sort of a dump of
126 S.M.A.R.T. data. Each field corresponds to an information field. The
127 standard field for drive temperature is 194. But this is not always
128 the case (mostly for older drives). Even if your drive has S.M.A.R.T.
129 capabilities, it doesn't necessarily mean that it can report its tem‐
130 perature. So, things must be determined through experimentation.
131 So, you can try to guess which field by is the good one by running
133 hddtemp at regular intervals:
134 - just after starting up your PC/server/station,
136 - after opening a window (a physical window :),
138 - after opening the case,
140 - whatever you can think of...
142 and looking for a field's value that would increase or decrease depend‐
144 ing on what effect you want to induce. Be careful, fields 4, 9, and 12
145 are often reported to match a temperature field but after some investi‐
146 gation they do not. But fields 194 (which is the standard field for
147 temperature) and 231 are good candidates.
148 Then, you can send me a report with outputs from `hddtemp --debug ...',
150 `smartctl' or `hdparm -i ...', and/or add an entry in hddtemp.db your‐
151 self.
152
155 If hddtemp crashes (yes, it might) for some unknown reasons, look for a
156 file named hddtemp.backtrace.<PID>.XXXXXX (where XXXXXX is a random
157 number generated at runtime) in /tmp. Then, you can then send me this
158 file and the hddtemp binary. The backtrace functionality is currently
159 supported on i386 architectures only.
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163 smartctl(8), syslog(3), syslogd(8).
164
167 Emmanuel Varagnat (hddtemp@guzu.net).
168 This manual page was originally written by Aurelien Jarno
170 <aurel32@debian.org>, for the Debian GNU/Linux system (but may be used
171 by others).
172 July 21, 2003 HDDTEMP(8)