Hard disk sentinel1/22/2024 ![]() ![]() ![]() function in modern motherboard BIOSes warns the user at this point before booting the operating system. Manufacturers/vendors replace the hard disk in the terms of warranty. If this is not true for a critical attribute, failure is predicted, the hard disk is considered bad and it should be replaced immediately (the attribute determines the problem). Note: software may display more information based on these fields (for example, the status of an attribute, which can be "OK" or "Always OK" etc.) and may give help in evaluation or management of the attributes.Īn attribute is correct, when the Value is greater than or equal with the Threshold. An attribute can be for example critical (able to predict failure) or statistical one (does not directly affect condition). Status flags: indicate the main purpose of the attribute. Worst (byte): the worst (smallest) value ever found in the previous lifetime of the hard disk. On a new hard disk, this number is high (a theoretical maximum, for example 100, 200 or 253) and it is decreasing during the lifetime of the disk. This number is calculated by the algorithm, using the raw data (see above). Value (byte): the current relative "health" of the attribute. Threshold (byte): the (failure) limit value for the attribute. Sometimes different parts (for example, low, middle, high 16 bits) of this value contain different kind of information. This data is then processed by an algorithm designed by the hard disk manufacturer. ĭata (6 bytes): raw measured values are stored in this field, provided by a sensor or a counter.Most applications provide name and textual description about the attributes. Many attributes have standard meanings (for example, 5 = number of reallocated sectors, 194 = temperature, etc). Identifier (byte): the meaning of the attribute. The measured values are then processed by some algorithms and the corresponding attributes are modified according the results.Ī single S.M.A.R.T. The current status of the hard disk are constantly examined by many sensors. ![]() attributes (for example: reallocated sector count, off-line uncorrectable sectors count, etc.) and their meanings. But in many cases this time is not enough - that's why it is important to recognize problems and prepare before it's too late.Ĭlick here to see the full list of S.M.A.R.T. specifications, when a problem is detected (failure predicted), the hard disk should work for at least 24 hours to perform the data backup. Newer applications are able to detect, process and display these information.Īccording the S.M.A.R.T. That's why for example it is possible to detect the temperature and the total power on time of many hard disks. Many attributes are used by all manufacturers and they are used in the same (or near same) way. For example, the difference between real temperature and the result measured by the sensor should be less than +/- 3 Celsius degrees. SCSI hard disks work differently: the failure predicition data is standard and there are strict rules about the sensors and algorithms. In this article, we discuss ATA (IDE and Serial ATA) hard disks only. It is not really a standard - so the meaning of the attributes may be different from manufacturer to manufacturer. Today all modern IDE/Serial ATA/SCSI hard disks have S.M.A.R.T. Some of them directly or indirectly affect hard disk health status and others give statistical information. A single ATA hard disk may have up to 30 such measured values, which are called attributes. It was created to monitor the disk status by using various methods and devices (sensors). (Self-Monitoring Analysis and Reporting Technology) is designed by IBM. Now, we want to make things clear.įirst, we examine what is S.M.A.R.T. It may be partially true - but the situation is not too simple. We can think that this function is not working or not too reliable because it is not able to predict disk failure in all cases. Some time ago an article published about hard disk reliability and the failure prediction function of hard disks. ![]()
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