choose between two ssd disks according to drivedx results

Discussion in 'Mac Basics and Help' started by Macintos, Aug 5, 2019.

  1. Macintos macrumors newbie

    Macintos

    Joined:
    Aug 5, 2019
    #1
    hello how are you
    I'm new to the forum, greetings

    sorry for my English :)
    I have a question to solve and I ask for help

    I have to choose between two used ssd disks that give these results with drivedx.
    Both discs work properly apparently, i have not noticed anything that makes me think that they could be giving failures...

    Apple SSD SD0128F (SanDisk-based):
    SSD Lifetime Left Indicator - 96.7
    Wear Leveling Count - 97

    and

    Apple SSD SM0256F (Samsung-based):
    SSD Lifetime Left Indicator - 100
    Wear Leveling Count - 74

    As I have read it seems that the result of Wear Leveling Count would be the most important, but the other result confuses me.

    Is the difference between both discs significant?
    Should I observe some other value of those provided by drivedx or some other tool?
    Which one would you choose?

    thank you very much for your attention
     
  2. Macintos thread starter macrumors newbie

    Macintos

    Joined:
    Aug 5, 2019
    #2
    Hello everyone...


    These are the results using command
    Code:
    smartctl -a /dev/sda
    from a linux usb-live system.

    Both discs work correctly, without any incident to mention, but I must choose one.

    There is really a big difference between them, because I prefer to choose the 256Gb one, of course, but maybe there is a defect with that model or something?


    APPLE SSD SD0128F (Sandisk-based)


    Code:
    Model Family:     Apple SD/SM/TS...E/F SSDs
    
    Device Model:     APPLE SSD SD0128F
    
    Serial Number:    1336A2406996
    
    LU WWN Device Id: 5 001b44 a3109ecd4
    
    Firmware Version: A222821
    
    User Capacity:    121,332,826,112 bytes [121 GB]
    
    Sector Sizes:     512 bytes logical, 4096 bytes physical
    
    Rotation Rate:    Solid State Device
    
    Form Factor:      Unknown (0x0012)
    
    Device is:        In smartctl database [for details use: -P show]
    
    ATA Version is:   ATA8-ACS T13/1699-D revision 6
    
    SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
    
    Local Time is:    Tue Aug  6 16:45:47 2019 UTC
    
    SMART support is: Available - device has SMART capability.
    
    SMART support is: Enabled
    
    
    === START OF READ SMART DATA SECTION ===
    
    SMART overall-health self-assessment test result: PASSED
    
    
    General SMART Values:
    
    Offline data collection status:  (0x00)    Offline data collection activity
    
                        was never started.
    
                        Auto Offline Data Collection: Disabled.
    
    Total time to complete Offline
    
    data collection:         (    0) seconds.
    
    Offline data collection
    
    capabilities:              (0x00)     Offline data collection not supported.
    
    SMART capabilities:            (0x0003)    Saves SMART data before entering
    
                        power-saving mode.
    
                        Supports SMART auto save timer.
    
    Error logging capability:        (0x01)    Error logging supported.
    
                        General Purpose Logging supported.
    
    
    SMART Attributes Data Structure revision number: 40
    
    Vendor Specific SMART Attributes with Thresholds:
    
    ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
    
      1 Raw_Read_Error_Rate     0x000f   100   100   000    Pre-fail  Always       -       0
    
      5 Reallocated_Sector_Ct   0x000f   100   100   000    Pre-fail  Always       -       0
    
      9 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       1964
    
    12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       12907
    
    169 Unknown_Attribute       0x0022   100   100   010    Old_age   Always       -       738908440288
    
    173 Wear_Leveling_Count     0x0022   187   187   100    Old_age   Always       -       906265231668
    
    174 Host_Reads_MiB          0x0030   100   100   000    Old_age   Offline      -       33776019
    
    175 Host_Writes_MiB         0x0030   100   100   000    Old_age   Offline      -       25314071
    
    192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       146
    
    194 Temperature_Celsius     0x0022   035   035   000    Old_age   Always       -       65 (Min/Max 25/82)
    
    197 Current_Pending_Sector  0x0032   000   000   000    Old_age   Always       -       0
    
    199 UDMA_CRC_Error_Count    0x003e   100   100   000    Old_age   Always       -       0
    
    244 Unknown_Attribute       0x0002   000   000   000    Old_age   Always       -       0
    
    
    SMART Error Log not supported
    
    
    SMART Self-test Log not supported
    
    
    Selective Self-tests/Logging not supported
    
    
    

    or


    APPLE SSD SM0256F (Samsung-based)


    Code:
    Model Family:     Apple SD/SM/TS...E/F/G SSDs
    
    Device Model:     APPLE SSD SM0256F
    
    Serial Number:    S18WNYBD659207
    
    LU WWN Device Id: 5 002538 655584d30
    
    Firmware Version: UXM2EA1Q
    
    User Capacity:    251.000.193.024 bytes [251 GB]
    
    Sector Sizes:     512 bytes logical, 4096 bytes physical
    
    Rotation Rate:    Solid State Device
    
    Device is:        In smartctl database [for details use: -P show]
    
    ATA Version is:   ATA8-ACS T13/1699-D revision 4c
    
    SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
    
    Local Time is:    Tue Aug  6 18:34:08 2019 CEST
    
    SMART support is: Available - device has SMART capability.
    
    SMART support is: Enabled
    
    
    === START OF READ SMART DATA SECTION ===
    
    SMART overall-health self-assessment test result: PASSED
    
    
    General SMART Values:
    
    Offline data collection status:  (0x00)    Offline data collection activity
    
                        was never started.
    
                        Auto Offline Data Collection: Disabled.
    
    Self-test execution status:      (   0)    The previous self-test routine completed
    
                        without error or no self-test has ever
    
                        been run.
    
    Total time to complete Offline
    
    data collection:         (    0) seconds.
    
    Offline data collection
    
    capabilities:              (0x5f) SMART execute Offline immediate.
    
                        Auto Offline data collection on/off support.
    
                        Abort Offline collection upon new
    
                        command.
    
                        Offline surface scan supported.
    
                        Self-test supported.
    
                        No Conveyance Self-test supported.
    
                        Selective Self-test supported.
    
    SMART capabilities:            (0x0003)    Saves SMART data before entering
    
                        power-saving mode.
    
                        Supports SMART auto save timer.
    
    Error logging capability:        (0x01)    Error logging supported.
    
                        General Purpose Logging supported.
    
    Short self-test routine
    
    recommended polling time:      (   2) minutes.
    
    Extended self-test routine
    
    recommended polling time:      (  10) minutes.
    
    
    SMART Attributes Data Structure revision number: 40
    
    Vendor Specific SMART Attributes with Thresholds:
    
    ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
    
      1 Raw_Read_Error_Rate     0x001a   200   200   000    Old_age   Always       -       0
    
      5 Reallocated_Sector_Ct   0x0033   100   100   000    Pre-fail  Always       -       0
    
      9 Power_On_Hours          0x0032   098   098   000    Old_age   Always       -       6683
    
    12 Power_Cycle_Count       0x0032   085   085   000    Old_age   Always       -       14949
    
    169 Unknown_Apple_Attrib    0x0013   253   253   010    Pre-fail  Always       -       2027568500480
    
    173 Wear_Leveling_Count     0x0032   174   174   100    Old_age   Always       -       2276384899741
    
    174 Host_Reads_MiB          0x0022   099   099   000    Old_age   Always       -       10004491
    
    175 Host_Writes_MiB         0x0022   099   099   000    Old_age   Always       -       8406574
    
    192 Power-Off_Retract_Count 0x0012   099   099   000    Old_age   Always       -       2166
    
    194 Temperature_Celsius     0x0022   061   061   000    Old_age   Always       -       39 (Min/Max 11/71)
    
    197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
    
    199 UDMA_CRC_Error_Count    0x001a   200   200   000    Old_age   Always       -       0
    
    240 Unknown_SSD_Attribute   0x0022   100   100   000    Old_age   Always       -       0
    
    
    SMART Error Log Version: 1
    
    No Errors Logged
    
    

    I thought maybe you could help me, because I'm a beginner and I'm afraid to choose the worst...
     
  3. NoBoMac Moderator

    NoBoMac

    Staff Member

    Joined:
    Jul 1, 2014
    #3
    No experience with these, but, my old Mac had a Samsung SSD (830) and is rock solid. Got almost 7 years out of it before the Mac died. Pulled the drive and put it into a chassis and still using it for archive purposes.

    This day and age, imo, SSDs will outlive the computer. Whatever is affordable and specs out well re read/write will be the correct choice. Need to write ALOT of data to wear out an SSD.
     
  4. aslr macrumors newbie

    Joined:
    Aug 7, 2019
    #4
    I agree with NoBoMac. However, wearing depends a lot on how full your SSD disk is. The fuller, the faster it will wear out. There is a really a nice explanation about that effect on YouTube.
     
  5. MSastre macrumors 6502a

    MSastre

    Joined:
    Aug 18, 2014
    #5
    I would definitely go with a 256GB drive over a 128GB drive. Twice the available space.
     
  6. Macintos thread starter macrumors newbie

    Macintos

    Joined:
    Aug 5, 2019
    #6
    Thank you very much for all the answers.

    I think I will choose the one of 256, because, I think it will be easier to have that 10% that they recommend in one of the YouTube videos...
     

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5 August 5, 2019