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S.M.A.R.T. attribute definitions

Reallocated Sectors Count - Attribute information

Attribute Name:

Reallocated Sectors Count

Attribute ID:



Count of reallocated sectors. When the hard drive finds a read/write/verification error, it marks this sector as "reallocated" and transfers data to a special reserved area (spare area).
This process is also known as remapping and "reallocated" sectors are called remaps. This is why, on a modern hard disks, you can not see "bad blocks" while testing the surface - all bad blocks are hidden in reallocated sectors. However, the more sectors that are reallocated, the more a sudden decrease (up to 10% and more) can be noticed in the disk read/write speed.



Hard drives that support this attribute:

Samsung, Seagate, IBM (Hitachi), Fujitsu, Maxtor, WD (Western Digital)

Software that supports this attribute:

ActiveSMART, by Ariolic Software

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S.M.A.R.T. attributes

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What is the S.M.A.R.T. attribute?
The S.M.A.R.T. attributes are specific properties (parameters) of various parts of a disk. S.M.A.R.T. uses attributes to monitor the disk condition and to analyze its reliability (e.g.: the "Temperature" attribute indicates the temperature of the hard disk, the "Power-On Hours" attribute indicates the count of hours in a power-on state, etc.) Various manufacturers may use different sets of attributes.

Want to protect your hard drive from a sudden breakdown?

Modern hard disks support a self-monitoring technology called S.M.A.R.T (Self-Monitoring, Analysis and Reporting Technology). This technology allows you to monitor the important parts of hard drives, warning you if their condition is getting worse and data loss is possible. However, in order to use this information, you will need special software which can collect and process it. Active SMART is intended for just this purpose.
Install Active SMART to protect your HDDs and the data stored on them.

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Related articles

 What is S.M.A.R.T. technology for hard drives
 What is a S.M.A.R.T. failure?
 Disk temperature
 What is the hard disk monitor and how it works?

S.M.A.R.T. attributes listed in the Active SMART attribute definitions list

Raw Read Error Rate
Througput Performance
Spin Up Time
Start/Stop Count
Reallocated Sector Count
Read Channel Margin
Seek Error Rate
Seek Time Performance
Power On Hours Count
Spin Retry Count
Recalibration Retries
Device Power Cycle Count
Soft Read Error Rate
G-Sense Error Rate
Power-Off Retract Cycle
Load/Unload Cycle Count
Reallocation Events Count
Current Pending Sector Count
SSD Program Fail Count (SSD)
Available Reserve Space (SSD)
Uncorrectable Sector Count
UltraDMA CRC Error Rate
Write Error Rate
Disk Shift
Loaded Hours
Load/Unload Retry Count
Load Friction
Load-in Time
Torque Amplification Count
GMR Head Amplitude


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