Diagnosis of Common Misconceptions on Hard Disk Drive - Part 2
Let's continue to diagnose the misconceptions on HDD(hard disk drive). What you have heard might be wrong completely.
Normally, after booting the system, hard disk will keep spinning until shutdown. The platters are driven by motor. It takes quite a while to keep the platters spinning at a constant speed. Thus if we stop the platters from spinning every time the hard drive is idle, that’ll take us additional time to launch the hard drive again. Therefore, for better result, we should keep the platters spinning no matter the hard drive is idle or not.
As a matter of fact, bad sectors are only bad sectors. There are no such things as logical bad sectors or physical bad sectors. Bad sectors are the sectors on a hard drive that cannot be read or written due to some permanent damages such as corrosion or concussion. Bad sectors cannot be repaired by disk formatting or disk utility software. We can only hide them.
There always are some redundant sectors hidden on a hard disk drive. Low-level formatting will replace the bad sectors with redundant sectors. But the number of redundant sectors on a hard drive is limited. Besides, the read/write head of HDD wears out quickly when it’s reading/writing data on redundant sectors. All these will significantly degrade the performance of HDD.
Furthermore, you should be careful once you notice any bad sectors appear on your hard drive. It’s definitely a warning for you. The bad sectors will get the neighboring sectors corroded and impair the stability of the actuator as well as the actuator arm. This will lead to hard disk failures again and again. What we suggest here is when you find bad sectors on your hard drive, please back up the important files on it as soon as possible then get a new hard drive to replace it.
This is a typical mistake in hard drive usage. Disk formatting is not a method to improve the overall performance of hard drive. If you find some degradation of hard drive performance after using it a few months, it’s because some fragments have been generated on the hard drive. This requires us to perform a defragmentation task.