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hardware:sd_memory_card

SD メモリーカード

Secure Digital は、正式には SD と略され、ポータブルデバイスで使用するために SD Association (SDA) によって開発された独自の不揮発性メモリカードフォーマットである。

SD メモリーカード (エスディーメモリーカード、SD Memory Card) は、フラッシュメモリーに属するメモリーカードである。SD カードとも呼ばれる。デジタルカメラ、携帯電話などの携帯機器やテレビなどの家電機器まで幅広く利用されている。
SDメモリーカード - Wikipedia
SD card - Wikipedia より
ギャラリー: Category:Secure Digital - Wikimedia Commons

規格

SD メモリーカードの属性情報

LinuxLinux カーネルを用いたオペレーティングシステム Kernel では /sys/block のエントリで確認できるが、SPI 接続されているカードスロットでなければならないようだ。
linux - Can I read SD card serial number connected with USB card reader/writer as mounted sda? - Stack Overflow
USB 大容量ストレージデバイス (USB Mass Storage Device) として Kernel が認識 (sda など) している SD カードリーダーでは、SD メモリーカードの属性情報にアクセスできない。

以下は Raspberry Pi Zero WH での SD メモリーカードの属性情報を読み出す Python コードである。

read_sd_attr.py
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import os
 
APPLICATION_NAME = 'SD and MMC Block Device Attributes Reader'
APPLICATION_VERSION = 0.02
SEPARATOR_LENGTH = 40
SYS_DEVICE = '/sys/block/mmcblk0/device'
 
# https://mjmwired.net/kernel/Documentation/mmc/mmc-dev-attrs.txt
SD_MMC_ATTRS = [
  'cid',                        # Card Identification Register
  'csd',                        # Card Specific Data Register
  'scr',                        # SD Card Configuration Register (SD only)
  'date',                       # Manufacturing Date (from CID Register)
  'fwrev',                      # Firmware/Product Revision (from CID Register) (SD and MMCv1 only)
  'hwrev',                      # Hardware/Product Revision (from CID Register) (SD and MMCv1 only)
  'manfid',                     # Manufacturer ID (from CID Register)
  'name',                       # Product Name (from CID Register)
  'oemid',                      # OEM/Application ID (from CID Register)
  'prv',                        # Product Revision (from CID Register) (SD and MMCv4 only)
  'serial',                     # Product Serial Number (from CID Register)
  'erase_size',                 # Erase group size
  'preferred_erase_size',       # Preferred erase size
  'raw_rpmb_size_mult',         # RPMB partition size
  'rel_sectors',                # Reliable write sector count
  'ocr',                        # Operation Conditions Register
  'dsr',                        # Driver Stage Register
  'cmdq_en',                    # Command Queue enabled: 1 => enabled, 0 => not enabled
]
 
def cat(filename):
    with open(filename) as fp:
        result = fp.read()
    return result.replace('\n', '\\n')
 
def main():
    print('\n' + '=' * 5 +
      f' {APPLICATION_NAME} Ver {APPLICATION_VERSION} ' +
      '=' * 5)
    print(f'device: {SYS_DEVICE}')
    print('-' * SEPARATOR_LENGTH)
    for index, attr in enumerate(SD_MMC_ATTRS):
        path = os.path.join(SYS_DEVICE, attr)
        if os.path.isfile(path):
            if attr == 'oemid':
                hex_string = cat(path)
                ascii_string = bytes.fromhex(hex_string.replace('\\n', '')[2:]).decode('ASCII')
                print(f'{attr}: {hex_string} (\'{ascii_string}\')')
            else:
                print(f'{attr}: {cat(path)}')
        else:
            print(f'{attr}: None')
    print('-' * SEPARATOR_LENGTH)
 
if __name__ == '__main__':
    main()

read_sd_attr.py

$ sudo apt install python3
$ curl -O https://www.tomoyan.net/_media/hardware/sd_memory_card/read_sd_attr.py
$ chmod 755 read_sd_attr.py
$ python3 read_sd_attr.py
===== SD and MMC Block Device Attributes Reader Ver 0.02 =====
device: /sys/block/mmcblk0/device
----------------------------------------
cid: 2750485344313238606cacbe1a01491f\n
csd: 400e00325b590003a13f7f800a40000f\n
scr: 0205808301000000\n
date: 09/2020\n
fwrev: 0x0\n
hwrev: 0x6\n
manfid: 0x000027\n
name: SD128\n
oemid: 0x5048\n ('PH')
prv: None
serial: 0x6cacbe1a\n
erase_size: 512\n
preferred_erase_size: 4194304\n
raw_rpmb_size_mult: None
rel_sectors: None
ocr: 0x00200000\n
dsr: 0x404\n
cmdq_en: None
----------------------------------------

Linux Kernel Documentation :: mmc : mmc-dev-attrs.txt
Reading Internal SD Card Information CID, Serial number, PSN, date, manufacturer ID - Camera Memory Speed Comparison & Performance tests for SD and CF cards
android - How to read the SD Card ID number? - Stack Overflow
https://nax9800.blog.fc2.com/blog-entry-158.html ← 警告: このサイト内の http://codegist.net/ に飛ばないで下さい!ブラウザーがフェイクアラートに感染します😱 その為、意図的にリンクしていません。内容を見るだけであれば問題は発生しません。

万が一感染しちゃったらこれを参考に駆除すれば特に問題はありません🤤 → このページの codegist.net に飛ばないでくださいね🧟 なんか呪われています😅💦 / Twitter

このサイト面白いけど飛ばないでくださいね😉ちょっとフェイクアラートを踏みに出かけています🤤同じURLに飛んでいるのに毎回違うURLに転送されますけど、読売や朝日の複製ページみたいですねぇ😁http://codegist*net/snippet/python/decode_sd_cidpy_mttronc_python / Twitter
つまり、過去に人気でアクセス量の多かったドメインを、悪徳業者はドメインが再購入可能になったら買い付けて、リンクしているページを利用して広告や詐欺誘導に悪用しているから放置できないってことです🤔理解できるかなぁ🤔悪徳業者に利用されていることを...🤔 / Twitter
ちなみに、この文献のインターネットアーカイブは存在していませんねぇ🤔誰もが必要とするようなコードではないので... codegist*netのアーカイブは2019年くらいまで何個か... だから、このURLを保持しておく価値は何もない😅💦http://codegist*net/snippet/python/decode_sd_cidpy_mttronc_python / Twitter

SD カードのオーバークロック

ベンチマーク

SAMSUNG EVO Plus 128GB MicroSDXC UHS-I U3

SAMSUNG EVO Plus 128GB MicroSDXC UHS-I U3 001

===== SD and MMC Block Device Attributes Reader Ver 0.02 =====
device: /sys/block/mmcblk0/device
----------------------------------------
cid: 1b534d4544345154304a4957e60133f7\n
csd: 400e00325b590003b9ff7f800a4040ab\n
scr: 02c5800300000000\n
date: 03/2019\n
fwrev: 0x0\n
hwrev: 0x3\n
manfid: 0x00001b\n
name: ED4QT\n
oemid: 0x534d\n ('SM')
prv: None
serial: 0x4a4957e6\n
erase_size: 512\n
preferred_erase_size: 16777216\n
raw_rpmb_size_mult: None
rel_sectors: None
ocr: 0x00200000\n
dsr: 0x404\n
cmdq_en: None
----------------------------------------

Format: exFAT
SAMSUNG EVO Plus 128GB MicroSDXC UHS-I U3 exFAT

Format: FAT32
SAMSUNG EVO Plus 128GB MicroSDXC UHS-I U3 FAT32

Format: NTFS
SAMSUNG EVO Plus 128GB MicroSDXC UHS-I U3 NTFS

Format: ext4 Ext2Fsd 0.69
SAMSUNG EVO Plus 128GB MicroSDXC UHS-I U3 ext4 Ext2Fsd 0.69

$ cd C:\Tools\Ext2Fsd\Setup
$ ./mke2fs -t ext4 d:
mke2fs 1.42.13 (17-May-2015)
 
Press ENTER to format d:
 
Creating filesystem with 31260160 4k blocks and 7815168 inodes
Filesystem UUID: b5089389-3cbd-4e3e-a423-187df44f9db6
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872
 
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

TeamGroup 128GB MicroSDXC Class3 UHS-I U3 V30 A1

TeamGroup 128GB MicroSDXC Class3 UHS-I U3 V30 A1 001

SD カード属性情報🤤

===== SD and MMC Block Device Attributes Reader Ver 0.02 =====
device: /sys/block/mmcblk0/device
----------------------------------------
cid: 452d4220202020201014a11ed90149a9\n
csd: 400e00325b590003ae077f800a400001\n
scr: 0245844300000000\n
date: 09/2020\n
fwrev: 0x0\n
hwrev: 0x1\n
manfid: 0x000045\n
name:      \n
oemid: 0x2d42\n ('-B')
prv: None
serial: 0x14a11ed9\n
erase_size: 512\n
preferred_erase_size: 4194304\n
raw_rpmb_size_mult: None
rel_sectors: None
ocr: 0x00200000\n
dsr: 0x404\n
cmdq_en: None
----------------------------------------

HIDISC 128GB MicroSDXC Class10 UHS-I U1

HIDISC 128GB MicroSDXC Class10 UHS-I U1

HIDISC 128GB MicroSDXC Class10 UHS-I U1 exFAT

------------------------------------------------------------------------------
CrystalDiskMark 7.0.0 x64 (C) 2007-2019 hiyohiyo
                                  Crystal Dew World: https://crystalmark.info/
------------------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

[Read]
Sequential 1MiB (Q=  8, T= 1):    98.764 MB/s [     94.2 IOPS] < 84116.88 us>
Sequential 1MiB (Q=  1, T= 1):    98.791 MB/s [     94.2 IOPS] < 10607.01 us>
    Random 4KiB (Q= 32, T=16):     7.073 MB/s [   1726.8 IOPS] <174815.60 us>
    Random 4KiB (Q=  1, T= 1):     6.635 MB/s [   1619.9 IOPS] <   615.89 us>

[Write]
Sequential 1MiB (Q=  8, T= 1):    54.634 MB/s [     52.1 IOPS] <151008.91 us>
Sequential 1MiB (Q=  1, T= 1):    54.080 MB/s [     51.6 IOPS] < 19339.41 us>
    Random 4KiB (Q= 32, T=16):     2.693 MB/s [    657.5 IOPS] <212134.09 us>
    Random 4KiB (Q=  1, T= 1):     2.638 MB/s [    644.0 IOPS] <  1549.78 us>

Profile: Default
   Test: 1 GiB (x5) [Interval: 5 sec] <DefaultAffinity=DISABLED>
   Date: 2021/09/30 16:26:06
     OS: Windows 10 Professional [10.0 Build 21322] (x64)

消費電力 Kingston UHS-II SD Reader USB Device (USB 3.0)
CrystalDiskMark Random Write 4KiB (Q= 32, T=16) の最大負荷時
HIDISC 128GB MicroSDXC Class10 UHS-I U1

KLEVV 128GB MicroSDXC Class10 UHS-I U3 A1

KLEVV 128GB MicroSDXC Class10 UHS-I U3 A1

KLEVV 128GB MicroSDXC Class10 UHS-I U3 A1 exFAT

------------------------------------------------------------------------------
CrystalDiskMark 7.0.0 x64 (C) 2007-2019 hiyohiyo
                                  Crystal Dew World: https://crystalmark.info/
------------------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

[Read]
Sequential 1MiB (Q=  8, T= 1):    98.730 MB/s [     94.2 IOPS] < 84165.56 us>
Sequential 1MiB (Q=  1, T= 1):    98.741 MB/s [     94.2 IOPS] < 10608.46 us>
    Random 4KiB (Q= 32, T=16):     6.636 MB/s [   1620.1 IOPS] <165210.29 us>
    Random 4KiB (Q=  1, T= 1):     6.078 MB/s [   1483.9 IOPS] <   672.69 us>

[Write]
Sequential 1MiB (Q=  8, T= 1):    58.219 MB/s [     55.5 IOPS] <141856.30 us>
Sequential 1MiB (Q=  1, T= 1):    59.541 MB/s [     56.8 IOPS] < 17281.55 us>
    Random 4KiB (Q= 32, T=16):     2.799 MB/s [    683.3 IOPS] <221729.16 us>
    Random 4KiB (Q=  1, T= 1):     2.715 MB/s [    662.8 IOPS] <  1506.50 us>

Profile: Default
   Test: 1 GiB (x5) [Interval: 5 sec] <DefaultAffinity=DISABLED>
   Date: 2021/09/30 16:15:44
     OS: Windows 10 Professional [10.0 Build 21322] (x64)

消費電力 Kingston UHS-II SD Reader USB Device (USB 3.0)
CrystalDiskMark Random Write 4KiB (Q= 32, T=16) の最大負荷時
KLEVV 128GB MicroSDXC Class10 UHS-I U3 A1

TOSHIBA EXCERIA 32GB MicroSDHC Class3 UHS-I U3

TOSHIBA EXCERIA 32GB MicroSDHC Class3 UHS-I U3 001

===== SD and MMC Block Device Attributes Reader Ver 0.02 =====
device: /sys/block/mmcblk0/device
----------------------------------------
cid: 02544d554330443320e834cba100f2fb\n
csd: 400e00325b590000e8ff7f800a4000af\n
scr: 02b5840332022902\n
date: 02/2015\n
fwrev: 0x0\n
hwrev: 0x2\n
manfid: 0x000002\n
name: UC0D3\n
oemid: 0x544d\n ('TM')
prv: None
serial: 0xe834cba1\n
erase_size: 512\n
preferred_erase_size: 4194304\n
raw_rpmb_size_mult: None
rel_sectors: None
ocr: 0x00200000\n
dsr: 0x404\n
cmdq_en: None
----------------------------------------

Kingston UHS-II SD Reader USB Device, exFAT
TOSHIBA EXCERIA 32GB MicroSDHC Class3 UHS-I U3 002 King exFAT

------------------------------------------------------------------------------
CrystalDiskMark 7.0.0 x64 (C) 2007-2019 hiyohiyo
                                  Crystal Dew World: https://crystalmark.info/
------------------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

[Read]
Sequential 1MiB (Q=  8, T= 1):    97.552 MB/s [     93.0 IOPS] < 85037.34 us>
Sequential 1MiB (Q=  1, T= 1):    95.505 MB/s [     91.1 IOPS] < 10957.39 us>
    Random 4KiB (Q= 32, T=16):     8.475 MB/s [   2069.1 IOPS] <128238.92 us>
    Random 4KiB (Q=  1, T= 1):     5.920 MB/s [   1445.3 IOPS] <   690.47 us>

[Write]
Sequential 1MiB (Q=  8, T= 1):    57.942 MB/s [     55.3 IOPS] <142239.11 us>
Sequential 1MiB (Q=  1, T= 1):    59.038 MB/s [     56.3 IOPS] < 17703.84 us>
    Random 4KiB (Q= 32, T=16):     0.258 MB/s [     63.0 IOPS] <645155.98 us>
    Random 4KiB (Q=  1, T= 1):     0.206 MB/s [     50.3 IOPS] < 19796.31 us>

Profile: Default
   Test: 1 GiB (x5) [Interval: 5 sec] <DefaultAffinity=DISABLED>
   Date: 2021/08/08 4:57:13
     OS: Windows 10 Professional [10.0 Build 21322] (x64)

TOSHIBA EXCERIA 32GB MicroSDHC Class3 UHS-I U3 001
TOSHIBA EXCERIA 32GB MicroSDHC Class3 UHS-I U3 002

消費電力 Kingston UHS-II SD Reader USB Device (USB 3.0)
CrystalDiskMark Random Write 4KiB (Q= 32, T=16) の最大負荷時
消費電力 Kingston UHS-II SD Reader USB Device (USB 3.0)
消費電力 Kingston UHS-II SD Reader USB Device (USB 2.0)
消費電力 Kingston UHS-II SD Reader USB Device (USB 2.0)

Kingston 128GB MicroSDXC UHS-I U1 V30 A1

===== SD and MMC Block Device Attributes Reader Ver 0.02 =====
device: /sys/block/mmcblk0/device
----------------------------------------
cid: 2750485344313238606cacbe1a01491f\n
csd: 400e00325b590003a13f7f800a40000f\n
scr: 0205808301000000\n
date: 09/2020\n
fwrev: 0x0\n
hwrev: 0x6\n
manfid: 0x000027\n
name: SD128\n
oemid: 0x5048\n ('PH')
prv: None
serial: 0x6cacbe1a\n
erase_size: 512\n
preferred_erase_size: 4194304\n
raw_rpmb_size_mult: None
rel_sectors: None
ocr: 0x00200000\n
dsr: 0x404\n
cmdq_en: None
----------------------------------------

ADATA 8GB MicroSDHC Class10 UHS-I U1

ADATA 8GB MicroSDHC Class10 UHS-I U1 001

FAT32
ADATA 8GB MicroSDHC Class10 UHS-I U1 002

------------------------------------------------------------------------------
CrystalDiskMark 7.0.0 x64 (C) 2007-2019 hiyohiyo
                                  Crystal Dew World: https://crystalmark.info/
------------------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

[Read]
Sequential 1MiB (Q=  8, T= 1):    96.448 MB/s [     92.0 IOPS] < 86166.02 us>
Sequential 1MiB (Q=  1, T= 1):    96.456 MB/s [     92.0 IOPS] < 10856.99 us>
    Random 4KiB (Q= 32, T=16):     6.298 MB/s [   1537.6 IOPS] <141063.60 us>
    Random 4KiB (Q=  1, T= 1):     5.940 MB/s [   1450.2 IOPS] <   688.33 us>

[Write]
Sequential 1MiB (Q=  8, T= 1):    25.571 MB/s [     24.4 IOPS] <316555.88 us>
Sequential 1MiB (Q=  1, T= 1):    25.743 MB/s [     24.6 IOPS] < 40529.21 us>
    Random 4KiB (Q= 32, T=16):     0.803 MB/s [    196.0 IOPS] <400271.89 us>
    Random 4KiB (Q=  1, T= 1):     0.768 MB/s [    187.5 IOPS] <  5309.21 us>

Profile: Default
   Test: 1 GiB (x5) [Interval: 5 sec] <DefaultAffinity=DISABLED>
   Date: 2021/09/30 12:32:51
     OS: Windows 10 Professional [10.0 Build 21322] (x64)

exFAT
ADATA 8GB MicroSDHC Class10 UHS-I U1 003

------------------------------------------------------------------------------
CrystalDiskMark 7.0.0 x64 (C) 2007-2019 hiyohiyo
                                  Crystal Dew World: https://crystalmark.info/
------------------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

[Read]
Sequential 1MiB (Q=  8, T= 1):    96.436 MB/s [     92.0 IOPS] < 86111.00 us>
Sequential 1MiB (Q=  1, T= 1):    96.459 MB/s [     92.0 IOPS] < 10857.97 us>
    Random 4KiB (Q= 32, T=16):     6.304 MB/s [   1539.1 IOPS] <139298.60 us>
    Random 4KiB (Q=  1, T= 1):     5.954 MB/s [   1453.6 IOPS] <   686.69 us>

[Write]
Sequential 1MiB (Q=  8, T= 1):    25.158 MB/s [     24.0 IOPS] <321547.76 us>
Sequential 1MiB (Q=  1, T= 1):    25.159 MB/s [     24.0 IOPS] < 41467.05 us>
    Random 4KiB (Q= 32, T=16):     0.977 MB/s [    238.5 IOPS] <384485.22 us>
    Random 4KiB (Q=  1, T= 1):     0.877 MB/s [    214.1 IOPS] <  4664.83 us>

Profile: Default
   Test: 1 GiB (x5) [Interval: 5 sec] <DefaultAffinity=DISABLED>
   Date: 2021/09/30 12:14:27
     OS: Windows 10 Professional [10.0 Build 21322] (x64)

消費電力 Kingston UHS-II SD Reader USB Device (USB 3.0)
CrystalDiskMark Random Write 4KiB (Q= 32, T=16) の最大負荷時
消費電力 Kingston UHS-II SD Reader USB Device (USB 3.0)

Transcend 16GB MicroSDHC Class10

Transcend 16GB MicroSDHC Class10 001

FAT32
Transcend 16GB MicroSDHC Class10 002

------------------------------------------------------------------------------
CrystalDiskMark 7.0.0 x64 (C) 2007-2019 hiyohiyo
                                  Crystal Dew World: https://crystalmark.info/
------------------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

[Read]
Sequential 1MiB (Q=  8, T= 1):    24.074 MB/s [     23.0 IOPS] <336350.42 us>
Sequential 1MiB (Q=  1, T= 1):    24.091 MB/s [     23.0 IOPS] < 43427.50 us>
    Random 4KiB (Q= 32, T=16):     4.482 MB/s [   1094.2 IOPS] <176364.14 us>
    Random 4KiB (Q=  1, T= 1):     4.295 MB/s [   1048.6 IOPS] <   951.28 us>

[Write]
Sequential 1MiB (Q=  8, T= 1):    12.373 MB/s [     11.8 IOPS] <626136.93 us>
Sequential 1MiB (Q=  1, T= 1):    11.534 MB/s [     11.0 IOPS] < 90095.49 us>
    Random 4KiB (Q= 32, T=16):     0.959 MB/s [    234.1 IOPS] <370025.75 us>
    Random 4KiB (Q=  1, T= 1):     0.889 MB/s [    217.0 IOPS] <  4598.42 us>

Profile: Default
   Test: 1 GiB (x5) [Interval: 5 sec] <DefaultAffinity=DISABLED>
   Date: 2021/09/30 14:12:18
     OS: Windows 10 Professional [10.0 Build 21322] (x64)

exFAT
Transcend 16GB MicroSDHC Class10 003

------------------------------------------------------------------------------
CrystalDiskMark 7.0.0 x64 (C) 2007-2019 hiyohiyo
                                  Crystal Dew World: https://crystalmark.info/
------------------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

[Read]
Sequential 1MiB (Q=  8, T= 1):    24.108 MB/s [     23.0 IOPS] <336230.98 us>
Sequential 1MiB (Q=  1, T= 1):    24.102 MB/s [     23.0 IOPS] < 43426.85 us>
    Random 4KiB (Q= 32, T=16):     4.487 MB/s [   1095.5 IOPS] <208138.05 us>
    Random 4KiB (Q=  1, T= 1):     4.282 MB/s [   1045.4 IOPS] <   954.30 us>

[Write]
Sequential 1MiB (Q=  8, T= 1):    12.580 MB/s [     12.0 IOPS] <616117.28 us>
Sequential 1MiB (Q=  1, T= 1):    11.530 MB/s [     11.0 IOPS] < 89132.66 us>
    Random 4KiB (Q= 32, T=16):     1.137 MB/s [    277.6 IOPS] <334235.28 us>
    Random 4KiB (Q=  1, T= 1):     1.009 MB/s [    246.3 IOPS] <  4050.58 us>

Profile: Default
   Test: 1 GiB (x5) [Interval: 5 sec] <DefaultAffinity=DISABLED>
   Date: 2021/09/30 14:01:14
     OS: Windows 10 Professional [10.0 Build 21322] (x64)

消費電力 Kingston UHS-II SD Reader USB Device (USB 3.0)
消費電力 Kingston UHS-II SD Reader USB Device (USB 3.0)

SanDisk 2GB MicroSD

exFAT
SanDisk 2GB MicroSD 002

SD カードリーダー

参考文献

付録

hardware/sd_memory_card.txt · 最終更新: 2021/10/01 11:19 by ともやん