The normalized values which range from 1 to 253, although some manufacturers will choose a starting point of 100 or 200 for some attributes, decrease from a higher starting point over time and it isn't necessarily a problem until it goes below the threshold value. The current normalized value is likely to be higher than the worst reported value and for most counters this is expected. The threshold value is set by the manufacturer to indicate when it will be considered a problem. SMART Countersĭon't freak out when you see the values being reported by these tools. Windows does not supply this capability so we need third-party tools such as CrystalDiskInfo and Hard Disk Sentinel to handle the job.
There are also command line tools such as smartctl which can be used to automate checking and reporting of drive status. It allows you to access the most important SMART counters as well as run both the short and extended SMART tests. Ubuntu, RedHat, and their derivatives have the Disks utility as part of their default installation. If the hard drive controller has reallocated the bad sector after the operating system marked the containing cluster as bad, re-running the appropriate command to re-evaluate the bad blocks ( chkdsk /b for Windows, e2fsck -cc for Linux – you must not use the -k option here since it would keep the current list of bad blocks) should clear it from the list.
Remember, the drive generally doesn't know something is wrong until it cannot read the sector and it does not attempt to remap the sector unless there are numerous failed reads or a write is attempted to that sector after a failed read. This is because the hard drive controller may not have dealt with the bad sector before the operating system had a problem with it. Since a cluster is normally several sectors and a single bad sector will get an entire cluster marked as bad, it is occasionally possible to recover those clusters. It is sometimes possible to recover blocks or clusters that have been marked as bad by the operating system.
0 kommentar(er)
