sdmon

This program reads out the health data of some industrial grade SD Cards. Unfortunately there is no standard way of doing this. Sdmon uses CMD56 of the SD card specification and currently does this for:

Apacer Industrial SD Cards, and some others from branded distributors
Kingston Industrial SD Cards (SDCIT/32GB and the SDCIT2/32GB where reported to work with the -a option, see Issue #6)
SanDisk Industrial SD Cards (code contributed by William Croft)

Although some of the above cards have been tested, there is no guarantee that a particular card of the above manufacturers will work.

The output of the program is JSON so that it can be parsed easier in applications using sdmon.

Installation

Released Version

For available versions see releases. Choose the correct archive for your os, i.e. sdmon-arm64.tar.gz for raspberry pi os 64bit or sdmon-armv7.tar.gz raspberry pi os 32bit. Adjust the path to the desired version by replacing v0.2.0 in the below example with the desired one.

curl -L https://github.com/Ognian/sdmon/releases/download/v0.2.0/sdmon-arm64.tar.gz | tar zxf -

Development Release

The latest development release may be also available.

curl -L https://github.com/Ognian/sdmon/releases/download/latest/sdmon-arm64.tar.gz | tar zxf -

Usage

The executable is statically linked, therefore it should work without any dependencies.

On a raspberry pi:

sudo ./sdmon /dev/mmcblk0

The -a option was introduced to allow extra time between the 2 CMD56 commands (1 second). Try first without it and if not successful try using the -a option like:

sudo ./sdmon /dev/mmcblk0 -a

Example Output

This is the output when the card doesn't support health status:

sudo ./sdmon /dev/mmcblk0
{
"version": "v.0.01-dirty (314f9dc)",
"date": "2022-04-07T16:18:24.000Z",
"device":"/dev/mmcblk0",
"idata.response[]":"0x900 0x00 0x00 0x00",
"error1":"1st CMD56 CALL FAILED: Operation timed out",
"error2":"2nd CMD56 CALL FAILED: Operation timed out"
}

Apacer Industrial micro SD card (99.97% healthy):

{
"version": "v0.3.2-dirty (262e866)",
"date": "2022-04-14T11:23:48.000Z",
"device":"/dev/mmcblk0",
"read_via_cmd56_arg_1":"read successful but signature 0xff 0xff"
"idata.response[]":"0x900 0x00 0x00 0x00",
"flashId": ["0x98","0x3c","0x98","0xb3","0x76","0x72","0x08","0x0e","0x00"],
"icVersion": ["0x1f","0xc3"],
"fwVersion": [83,201],
"ceNumber": "0x01",
"spareBlockCount": 46,
"initialBadBlockCount": 72,
"goodBlockRatePercent": 97.56,
"totalEraseCount": 1380,
"enduranceRemainLifePercent": 99.97,
"avgEraseCount": 1,
"minEraseCount": 1,
"maxEraseCount": 5,
"powerUpCount": 55,
"abnormalPowerOffCount": 0,
"totalRefreshCount": 0,
"productMarker": ["0x00","0x00","0x00","0x00","0x00","0x00","0x00","0x00"],
"laterBadBlockCount": 0,
"success":true
}

Sandisk Industrial SD card (99% healthy)

sudo ./sdmon /dev/mmcblk0
{
"version": "v0.3.2-3 (a04b618) arm64",
"date": "2022-04-14T08:27:15.000Z",
"device":"/dev/mmcblk0",
"signature":"0x44 0x53",
"SanDisk":"true",
"manufactureYYMMDD": "211122",
"healthStatusPercentUsed": 1,
"featureRevision": "0x1f",
"generationIdentifier": 5,
"productString": "SanDisk                         ",
"success":true
}

Western Digital Purple QD101

sudo ./sdmon /dev/mmcblk0
{
"version": "v0.9.0 (4dff9b6) arm64",
"date": "2024-08-04T23:41:55.000",
"device":"/dev/mmcblk0",
"addTime": "false",
"signature":"0x44 0x57",
"SanDisk":"true",
"manufactureYYMMDD": "240403",
"healthStatusPercentUsed": 1,
"featureRevision": "0x1f",
"generationIdentifier": 7,
"productString": "Western Digital                 ",
"powerOnTimes": 14,
"success":true
}