What does "bad sectors" mean?

[teflonfrog]

What do they mean? What is a "logical" bad sector and what is a "hardware" bad sector? Thanks.

 

[little_me]

you could have typed that question in google:
http://www.addictivetips.com/windows-tips/what-are-physical-logical-hard-drive-bad-sectors-how-to-repair-them/

Edit:
In short, logical is sofware (in most cases, windows) failing read/write operation at a sector of disk, thus marking it as "bad"
Hardware is.. that disk itself decides that "this doesn't work, I will not use this sector anymore" which is often a result of physical problem on the drive platter.

Out of the two, Logical ones are not necessarily truly bad and might be working with a few tries, chkdsk [diskletter] /B tries to re-evaluate those.
It doesn't always work though and in all cases with bad sectors appearing, backup important things ASAP, if things go south, you didn't lose anything too important in that case.

 

[junkeymonkey]

https://en.wikipedia.org/wiki/Bad_sector

data don't cause this its all a mechanical fault of the drive .

'' Types of Bad Sectors ''

http://www.howtogeek.com/173463/bad-sectors-explained-why-hard-drives-get-bad-sectors-and-what-you-can-do-about-it/