I bought a Mac Mini (Intel CPU) about two years ago, and its disk "percentage used" is already 12%, and there are 160TB write (and 150TB read). Compared with other programmers, seems that mine is a little bit too much - many are only one third / half / even smaller compared with mine.

Therefore, I wonder:

  1. Is this normal or abnormal?
  2. What should I do to improve the situation?

More information (not sure whether this is related):

  • CPU is intel i7
  • Memory is 32GB
  • Usually see a swap of 8G~32G
  • The only usage is to do programming, no games, video-cutting, etc

Smartctl info:

smartctl -a disk0
smartctl 7.2 2020-12-30 r5155 [Darwin 20.6.0 x86_64] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

Model Number:                       APPLE SSD AP0512M
Serial Number:                      C07016500EBJRV2AC
Firmware Version:                   1274.80.
PCI Vendor/Subsystem ID:            0x106b
IEEE OUI Identifier:                0x000000
Controller ID:                      0
NVMe Version:                       <1.2
Number of Namespaces:               1
Local Time is:                      Fri Mar 18 13:29:46 2022 CST
Firmware Updates (0x02):            1 Slot
Optional Admin Commands (0x0004):   Frmw_DL
Optional NVM Commands (0x0004):     DS_Mngmt
Maximum Data Transfer Size:         256 Pages

Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
 0 +     0.00W       -        -    0  0  0  0        0       0

SMART overall-health self-assessment test result: PASSED

SMART/Health Information (NVMe Log 0x02)
Critical Warning:                   0x00
Temperature:                        56 Celsius
Available Spare:                    100%
Available Spare Threshold:          99%
Percentage Used:                    12%
Data Units Read:                    294,059,879 [150 TB]
Data Units Written:                 313,120,408 [160 TB]
Host Read Commands:                 2,841,131,534
Host Write Commands:                2,066,894,996
Controller Busy Time:               0
Power Cycles:                       154
Power On Hours:                     2,209
Unsafe Shutdowns:                   49
Media and Data Integrity Errors:    0
Error Information Log Entries:      0

Read 1 entries from Error Information Log failed: GetLogPage failed: system=0x38, sub=0x0, code=745

Thanks for any suggestions!

  • Which problem are you trying to solve here?
    – nohillside
    Mar 18 at 6:37
  • I guess the question to ask you is: does that seem like a reasonable amount of data for your usage? If you're seeing a "usual" level of swap between 8Gb and 32 Gb, then that's quite a high level, which suggests you're using large amounts of data, which is not only getting swapped, but also saved.
    – benwiggy
    Mar 18 at 7:55
  • Even so, at 6% per year, it will last you 16 years.
    – benwiggy
    Mar 18 at 7:56
  • @nohillside Is this normal or abnormal? What should I do to improve the situation? Thanks
    – ch271828n
    Mar 18 at 10:29
  • @benwiggy Thanks for the reply! But interestingly, the "memory pressure" is usually low (average 25%). So what should I do to improve the situation? I am already having a 32GB memory.
    – ch271828n
    Mar 18 at 10:30


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