7 ms·
> The 100 is a normalized number, it's not the actual number of blocks. I'm not too sure about that. The only ref I can give is that they use the suffix "Cnt_T
by jmpe 12y ago
> The 100 is a normalized number, it's not the actual number of blocks.
I'm not too sure about that. The only ref I can give is that they use the suffix "Cnt_Tot" which means "total count". When it's a percentage they denote it as such as in "Perc_Rated_Life_Used" and "Workld_Host_Reads_Perc". Don't be surprised by the low count (100).
- yuriks 12y agoThat's how SMART attributes work. 100 means AOK and 0 means failed. The normalized number is reported by the drive, calculated by a formula based off the raw values and MTBF data determined by the manufacturer.
- jmpe 12y agoOk, dug around in the code. In Smartmontools I found the code for this variable: http://smartmontools.sourceforge.net/doxygen/atacmds_8cpp_source.html http://smartmontools.sourceforge.net/doxygen/atacmds_8cpp_so... It's code 179 (0xB3). From Samsung's website: http://www.samsung.com/global/business/semiconductor/minisite/SSD/global/html/about/whitepaper07.html http://www.samsung.com/global/business/semiconductor/minisit... 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. .. so at least for samsung there's use of exact numbers. From Intel's website: http://download.intel.com/newsroom/kits/ssd/pdfs/intel_ssd_520_product_spec_325968.pdf http://download.intel.com/newsroom/kits/ssd/pdfs/intel_ssd_5... (Ctrl-F for "Available Reserved Space") .. they use a normalized value (100). So it can be either percentage or absolute value, depending on manufacturer.