![]() The Raw value shows the actual powered-on time, usually in hours. (ever seen a DatA General hard disk crash? and fill the room with vast amounts of aluminum wool, curly cues? lots of fun back then. The normalized value decreases over time, typically from 100 to 0. (im backed up ) (no lack of cooling ever.) heat is the #1 killer and power surges, I run a UPS. I'm typing this, on an old PC, running one of the first 1gb HDD ever made. If you run the disk cool, it will last a long time and you many never run out of spare cylinders. The smart value of 100 in power cycle count indicates that out of 100, the drive still has 100 of it’s rated operating hours left. and are read again, and usually pass the test for CRC errors. Point 2: all HDD have natural read errors, you can learn that at Seagate too, if you want. So like he says above, it's not important unless you have many drives of the same kind and you see some odd trends. Whether the manufacturer chooses to report raw errors whenever there are 3 bad reads or after the calibrate is up to them. This is deep in the firmware, but happens continually in the background, all transparent to the user. Transmit Smart power is enabled by default via the DISSTXP bit in. By default, the total expected lifetime of a hard disk in perfect condition is defined as 5 years running every day & night on all days. The snooze count times are in units of the raw 19.2 MHz XTI clock rate, (since. Since the Spin up time is 'average' 1. If the drive is still not ok it will map that sector to one of the spare sectors. The raw value of this attribute shows total count of hours or minutes, or seconds, depending on manufacturer in power-on state. I got those values from the 'Get SMART Data' feature in HDDGurus Low Level Format tool. There is a 3 times rule in the drive's firmware - it reads a sector 3 times and if all 3 times it is bad then it may do a "recalibrate" on the fly, and read 3 more times. More often than not SMART attributes are completely undocumented and the interpretation of their raw values is a pure guesswork on smartctl devs part. This is all transparent to the outside world - except for the SMART util.Įach manufacturer can do as they please, so some set the error counts to zero, even though there might be 10 bad sectors as soon as the drive is manufactured. In fact they are "logically swapped out" - the bad sector is mapped to a new, good, spare cylinder sector (it has spare cylinders - think of cylinders as tracks). ![]() So they map them out, this means the drive skips bad sectors. In the olden days, we had to enter the bad sectors in to the HDD controllerįrom a list on paper that came in the new drive box, so the controller skips them. I have three 1TB RE3 (WDC WD1002FBYS-01A6B0) and three 160GB RE1 (WDC WD1600YS-01SHB1) installed in my local servers. There is no perfect HDD, never was, never will be, (history and fact). Incorrect SMART Power On Hours (RE3 1TB) WD Internal Drives Desktop & Mobile Drives. ![]() You will see how HDD's are made, tested and how they really work. If you read the data sheets (white papers) say at
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