I just upgraded the HDD of my macbook pro 13", from a stock Hitachi 160G 5400RPM to a Hitachi 500GB 7200RPM, the HDD is fine, quiet(although a little bit noisier than previous one), cool and fast. As the previous HDD suffers from fast-increasing Load_Cycle_Count, I checked the new one using smartmontools(installed via MacPort), unsurprisingly it has the same problem.
Here is what Load Cycle Count means from Wikipedia:
Count of load/unload cycles into head landing zone position.[15]
The typical lifetime rating for laptop (2.5-in) hard drives is 300,000 to 600,000 load cycles.[16] Some laptop drives are programmed to unload the heads whenever there has not been any activity for about five seconds.[17] Many Linux installations write to the file system a few times a minute in the background.[18] As a result, there may be 100 or more load cycles per hour, and the load cycle rating may be exceeded in less than a year.[19]
Recall that for the previous HDD I used Hitachi's Feature Tool to reset its APM level to 192, and LCC merely increases, but a PC laptop is needed for doing this and I currently do not have a PC laptop, so I cannot do it for the new HDD. Then I searched on the internet and found this thread:
https://forums.macrumors.com/threads/910582/
Which mentions LCC is actually not related to the 600000 times count but start/stop count is, then I found:
I found the HDD's webpage from Hitachi:
http://www.hitachigst.com/internal-drives/mobile/travelstar/travelstar-7k500
There is a data sheet, that states:
Load / Unload cycle 600,000
Then I'm confused, is it the spin-up/spin-down time but use the same attribute name "Load / Unload cycle" which is equivalent to "Start/Stop Cycles" in SMART and SMART uses the same attribute name(LCC) for another attribute?
Have you ever worried about your HDD?
Here is what Load Cycle Count means from Wikipedia:
Count of load/unload cycles into head landing zone position.[15]
The typical lifetime rating for laptop (2.5-in) hard drives is 300,000 to 600,000 load cycles.[16] Some laptop drives are programmed to unload the heads whenever there has not been any activity for about five seconds.[17] Many Linux installations write to the file system a few times a minute in the background.[18] As a result, there may be 100 or more load cycles per hour, and the load cycle rating may be exceeded in less than a year.[19]
Recall that for the previous HDD I used Hitachi's Feature Tool to reset its APM level to 192, and LCC merely increases, but a PC laptop is needed for doing this and I currently do not have a PC laptop, so I cannot do it for the new HDD. Then I searched on the internet and found this thread:
https://forums.macrumors.com/threads/910582/
Which mentions LCC is actually not related to the 600000 times count but start/stop count is, then I found:
Some of that report is the result of a misunderstanding:
my Load_Cycle_Count is now at 718,694. this is very bad because the average Load_Cycle_count before failure for most hard disks is 600,000.
This is simply not true. Most laptop drives have a specification that says that it should survive approximately half a million spin-up/spin-down. But Load_Cycle_Count is not spin-up/spin-down (which is tracked by Start_Stop_Count instead). Most drives specs don't say anything about the expected number of "load_cycle" that the drive is expected to survive. This high number of load_cycle is because the drive aggressively moves (unloads) the head away from the disk after a very short time of idleness. It does this not so much to save power as to avoid crashing the head against the disk in case of a shock. I.e. this number is high so as to avoid data loss.
Other drives only unload the heads when the disk spins up/down, so on some drives Start_Stop_Count=Load_Cycle_Count. Yet others don't even bother to report Load_Cycle_Count.
I found the HDD's webpage from Hitachi:
http://www.hitachigst.com/internal-drives/mobile/travelstar/travelstar-7k500
There is a data sheet, that states:
Load / Unload cycle 600,000
Then I'm confused, is it the spin-up/spin-down time but use the same attribute name "Load / Unload cycle" which is equivalent to "Start/Stop Cycles" in SMART and SMART uses the same attribute name(LCC) for another attribute?
Have you ever worried about your HDD?