Samsung 840 White Paper page 25

DIPM (Device Initiated Power Management) feature. Thus, with this feature enabled, this attribute excludes any time the
device spends in a "sleep" state. With DIPM off, the recorded value will include all three device power states: active, idle,
and sleep.
ID # 12 Power-On Count
The raw value of this attribute reports the cumulative number of power on/off cycles. This includes both sudden power
off and normal power off cases.
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.
ID # 181 Program Fail Count (total)
This attribute represents a total count of the number of failed program requests (failed writes).
ID # 182 Erase Fail Count (total)
This attribute represents a total count of the number of failed erase requests.
ID # 183 Runtime Bad Count (total)
Equal to the sum of the Program Fail count (attribute 181), the Program Erase Fail count (attribute 182), and the Read
Fail count. This summary value represents the total count of all read/program/erase failures.
ID # 183 Uncorrectable Error Count
The total number of errors that could not be recovered using ECC.
ID # 190 Air Flow temperature
The current temperature of the area surrounding the NAND chips inside of the SSD.
ID # 195 ECC Error Rate
The percentage of ECC correctable errors
ID # 199 CRC Error Count
The number of Cycle Redundancy Check (CRC) errors. If there is a problem between the host and the DRAM or NAND
flash, the CRC engine will tally the error and store it in this attribute.
ID # 235 Power Recovery Count
A count of the number of sudden power off cases. If there is a sudden power off, the firmware must recover all of the
mapping and user data during the next power on. This is a count of the number of times this has happened.
ID # 241 Total LBAs Written
Represents the total size of all LBAs (Logical Block Address) required for all of the write requests sent to the SSD from
the OS. To calculate the total size (in Bytes), multiply the raw value of this attribute by 512B. Alternatively, users may
simply consult the Total Bytes Written indicator in Magician 4.0.