SSD Write Endurance 25nm Vs 34nm

[devsk]

I can understand "smartctl -a /dev/sda" better.

-a will give unmolested statistics from the drive's smart function.

Having software molest the data tends to lose some of the information.

I think you misunderstood. These new stats are part of the standard now and are directly exported by the firmware. The SMART stats attributes are a mess. They were not there in the standard and are generally used incoherently by vendors (seen those Unknown attributes?). ACS-2 came up with SSD Device Statistics standard and they are now available through Device Statistics (GP Log 0x04) from the SSD in the form of various pages. Crucial is one of the few vendors who are correctly filling in those stats. You won't find these stats from SMART attributes. For example, Page 1 (shown below) is missing is completely in SMART attributes on an M4. Kudos to Crucial for being ACS-2 compliant...

# smartctl -l devstat,1 /dev/sda
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.12.5] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

Device Statistics (GP Log 0x04)
Page Offset Size         Value  Description
  1  =====  =                =  == General Statistics (rev 2) ==
  1  0x008  4              153  Lifetime Power-On Resets
  1  0x010  4            20590  Power-on Hours
  1  0x018  6      13762870401  Logical Sectors Written
  1  0x020  6        323042073  Number of Write Commands
  1  0x028  6      24966539804  Logical Sectors Read
  1  0x030  6        460248105  Number of Read Commands

So, now can you give me those stats from your M4 if you have it running endurance?....

Really, they will help me in my analysis of M4's wear characteristics.