What does the health status percentage represent in CrystalDiskInfo?

Question

I wonder what the health status percentage represents in CrystalDiskInfo:

100%:

99%:

91%:

Absent:

I use CrystalDiskInfo on Windows 7 SP1 x64 Ultimate.

Solution

The health status percentage for SSD is intended to show the remaining life while in implementation it is just the calibrated percentage of a reference smart attribute chosen by CrystalDiskInfo (see official manual) which is specific to the SSD brand.

Supporting evidence:
Both 2nd and 3rd SSD from Crucial show percentage of 0xAD attribute. 1st SSD from Samsung shows 0xB3, while it should have been 0xB1, or a weighted sum of the two.

From Samsung SSD White Paper:

ID #177 Wear Leveling Count
This attribute represents the number of media program and erase operations (the number of times a block has been erased). This value is directly related to the lifetime of the SSD. The raw value of this attribute shows the total count of P/E Cycles.

ID #179 Used Reserved Block Count (total)
This attribute represents the number of reserved blocks that have been used as a result of a read, program or erase failure. This value is related to attribute 5 (Reallocated Sector Count) and will vary based on SSD density.

Comments

[Admin]

This HDD diagnostic utility is an solid source of information about the health & SMART status of your mechanical hard drive, @Franck! However, keep in mind that it's advisable to use the HDD manufacturer's diagnostic tool as well to monitor these stats. As for your SSDs, I'd recommend you use a specific diagnostic utility as it would give you more accurate results about the SMART data. There are specific health-monitoring software for the different kind of hardware. Hope this helped! Good luck! :)