Self monitoring, analysis and reporting Technology

Self monitoring, analysis and reporting Technology, briefly S.M.A.R.T., (system for the self-monitoring, analysis and status message) is a diagnostic system built into computer non removable disks. It makes the permanent supervising of important parameters and thus the early recognizing possible of threatening defects.

Table of contents


something similar the selection of the error memory of an automobile evaluating the supervised data takes place when starting of the PC via the accordingly adjusted BIOS or via special software, which must be installed additionally to the operating system. Microsoft for example makes for this since Windows 98 only one driver available, which is then addressed by this software. Only it can evaluate the data and indicate possible warnings.

The program orients itself on from the non removable disk manufacturer specified limit values for the individual parameters, approximately for the temperature. After a longer period the software can prognosticate then losses also still which can be expected.

S.M.A.R.T. thereby no statement remains limited for the total reliability of the computer to the non removable disk and supplies. Also no cross-linking of the won data of several non removable disks takes place. The moreover one the system does not represent a standard. It is left to the non removable disk manufacturers, who parameter supervises it and embeds into which borders it these. Among users also the accuracy of the monitoring is discussed. Thus some temperature sensors are considered as too optimistic adjusted or platziert, since they are clearly with the start of the system under ambient temperature. Still more with difficulty to discover are overflow of individual parameters. Similarly the passenger car run achievement for instance the period of operation of the non removable disks is taken in account. The zero-runs of these counters are logged neither, nor by visual check recognizably.


1992 recognized IBM that with increasing spreading of PCs in enterprises likewise the confidence set into it rose. Losses became increasing a financial problem, which one wanted to meet with PFA (Predictive failure analysis). IBM non removable disks with this system communicated any changes of parameter, whose user could react so in time with exchange to the computer. By Compaq IntelliSafe one introduced somewhat later. This filters Unrelevantes and announces to the running along software only the threatening changes and being. Seagate, quantity and Conner were involved in the development and adapted it to their products; Compaq did not manufacture non removable disks.
The Potenzial suspecting and with an industry standard before eyes was forced the disclosure of the system by Compaq and in particular Seagate. Together with Conner, quantity, Western digital and then also IBM developed a fusion of the two beginnings under the name S.M.A.R.T.

Since 1996 and the start of the ATA -3-Standards respectively to SCSI -3 four years before it belongs near excludeless to the Standardausstattung of a non removable disk.

two variants: ATA and SCSI

the realization S.M.A.R.T. - Standards differs with the non removable disk connections.

In the ATA standard the running along software queries periodically all values and their borders. It decides thereupon, whether a warning is worthwhile itself, or the border is spaciously fallen below. With SCSI drive assemblies this decision takes place in the non removable disk. The software can select only “okay” or “problematic” and pass on to the user or the log file.

usual parameters

each value becomes first as Raw DATA, e.g. 30 °C for the temperature stored. This is then sorted to a value scale from 0 to 100. From this in the following one proceeds.

  • Raw READ error rate
    • Nichtkorrigierbare error when reading the non removable disk.
    • Points on problem with the read-write heads or the disk surface.
    • Starts with a high value and approaches with each error zero.
    • Also of the manufacturer unerklärt, here some Seagate drive assemblies fresh from the factory register values well under 100.
  • Throughput performance
    • general information flow-rate/efficiency of the non removable disk.
    • Points strongly on braking problems in the drive assembly.
    • Starts with a high value and approaches in the case of errors zero.
  • Spin UP Time
    • average of the starting time
    • points on problems with the engine or the Platten-Lagern.
    • Starts with a high value and approaches in the case of errors zero.
    • With max gate and quantity drive assemblies fresh from the factory it comes here in the first month frequently to false alarms.
  • Start/stop COUNT
    • amount of the start/stop procedures of a drive assembly (also Standby).
    • Points on wear, since this procedure loads non removable disks most strongly.
    • Starts with high value and one reduces, until MTBF reaches.
  • Reallocated of second gate COUNT
    • number of used up reserve sectors.
    • Points on surface problems, since only then a reserve sector replaces a normal automatically.
    • Starts with high value and to 1 one reduces, if reserve sector zone exhausts.
  • Power on Hours COUNT
    • run achievement in hours or seconds.
    • Points on wear, however nothing states over use circumstances in this time.
    • Starts with high value and to 1 one reduces, if MTBF run off.
    • Fujitsu - drive assemblies of the series Picobird 10 (MPA) to 16 (MPG) use a second counter, which already overflows with 999.999s (277h).
  • Drive Temperature
    • temperature of the drive assembly in °C.
    • Since also maximum and minimum value are stored, an undercooling/an overheating is recognizable.
    • Starts with high value and to 0 one reduces, if borders exceeded during enterprise.
    • Some manufacturers use inaccurate or Hotspot - far sensors.

There are still numerous further parameters, also manufacturer-exclusive. Complete lists are in the literature section Web on the left of.

Web on the left of

  • General software
    • [EN/Windows/Freeware] DTemp
    • [EN/Windows/Freeware] HDD Health
    • [de/Windows/demo or starting from $29] HDD would run
    • [de/Windows/Freeware] hp Tune
    • [EN/Windows/demo or starting from $24,95] ActiveSmart ATA / SCSI
    • [EN/Windows/demo or starting from $14,95] SiGuardian
    • [de/Windows/demo or starting from 19,90€ ] O&O drive LED
    • [EN/Windows/Freeware] speed fan
    • [EN/Windows, MacOS, Linux, FreeBSD, NetBSD, OpenBSD, Solaris, Darwin, OS/2/open SOURCE] Smartmontools
    • [EN/DOS/Freeware] HDAT2


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