POH (Power on hours hours turned on). ES an estimate of the number of hours that the disc might be lit every year. But it also appears in hours by days of the week. For example. Discs 24 (hours) there are x 7 (days a week) i.e., that can be continuously encedidos.

Temperature (ambient temperature operation). According to the type of disc is usually in a ranto between 0 and 60 degrees. Outside these ranges usually the disk is not operating. The ideal working temperature may be between 20-25 c so that all representative variation, above all on the upside, will influence negatively the MTBF. It might be interesting to add some kind of refrigeration to the disc if it deemed necessary. Power failures that can cause interruptions in power to the disks, use during more hours of that for which were manufactured (POH), or keep them working at high temperatures will negatively influence their MTBF and therefore in its lifetime. To check the status of our drives we could monitor them regularly through what is known as SMART technology acronym for Self Monitoring Analysis and Reporting Technology and which is implemented in most of the current discs due to its great utility.

It consists of the disk capacity of auto-detect internal failures, allowing the user to be able to take appropriate measures until there is an unrecoverable loss of data. The motherboard BIOS must also allow its activation. Among the most important parameters that can be monitored on the disk are: temperature of the drive (Temperature), frequency of errors in reading (Raw Read Error Rate), time required to start turn (spin-up time), sectors reassigned by defects counter (Reallocated sector count), time search and positioning (Seek time performance), frequency errors of search (Seek Error Rate), frequency of errors in writing (Write Error Rate)Efficiency of the disc (Throughput performance), number of hours in operation (Power-on hours), etc. Disc stores both the current values of the parameters and the optimal operating thresholds below which, depending on the importance of the parameter, it is important to take some measure of caution as for example backup, or even pose urgent cloning from the disk for replacement. To verify the parameters can be any of the following free programs SMART discs: Speedfan (almic). This software for Windows in addition to providing information about the temperature of the internal components of the computer also provides information on SMART parameters of discs. Highly recommended! Smartmontools (sourceforge). Software to monitor the disks in linux environments. Ultimately, either choose the hard drive according to your needs, which you almacenaras information and monitors their status regularly to prevent losses.

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