Sd Card Cid Rewrite

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  1. How To Change Cid On Sd Card
  2. Sd Card Cid Register
  3. Sd Card Cid Reader
  4. Sd Card Cid Rewriter

SD card reader problem (write-protect to ALL SD cards) The problem is that I have been using an SD card (Lexar Multi-Use 4GB SDHC) that I use in my 3DS, and when I have to transfer files, I put it in my computer (Acer Aspire XC-704 running Windows 10) and transfer. Thanks to Richard Burton and Alessandro Maestroni. Internal SD Card Information. Information about an SD card is encoded in its internal card registries. One of these is the Card Identification (CID) Register, a 16 byte code that contains information that uniquely identifies the SD card, including the card serial number (PSN), manufacturer ID number (MID) and manufacture date (MDT). IF YOU ARE LOOKING Read the CID number of an SD card Extract the CID off an SD card You can only do this with specific hardware You cannot read the CID through a computer SD socket 3. All GPS devices and most phones will lock software to the CID number of a SD or microSD card 4. The CID number is a unique string of digits that are unique to. The App show you CID numbers of all installed storage devices. @Android 7+ Users: CID File read access is restricted by many devices. @DownVoters: This App is free and written in hope to help users. I can't test it on all possible devices! If it don't works on your device and you are one from hundreds, maybe it's manufacturer dependent.

CID Register
The Card Identification (CID) register is 128 bits wide. It contains the card identification information used during the card identification phase. Every individual Read/Write (RW) card shall have a unique identification number. The structure of the CID register is defined in the following paragraphs:
NameFieldWidthCID-slice
Manufacturer IDMID8[127:120]
OEM/Application IDOID16[119:104]
Product namePNM40[103:64]
Product revisionPRV8[63:56]
Product serial numberPSN32[55:24]
Reserved--4[23:20]
Manufacturing dateMDT12[19:8]
CRC7 checksumCRC7[7:1]
Not used, always 1-1[0:0]

Table 2: The CID Fields
  1. MID

Binary number of 8-bit that identifies the manufacturer of the card. The MID number is controlled, defined, and allocated to a SD Memory Card manufacturer by the SD-3C, LLC. This procedure is established to ensure uniqueness of the CID register.
  1. OID

A 2-character ASCII string that identifies the card OEM and/or the card contents (when used as a distribution media either on ROM or FLASH cards). The OID number is controlled, defined, and allocated to a SD Memory Card manufacturer by the SD-3C, LLC. This procedure is established to ensure uniqueness of the CID register.
Note: SD-3C, LLC licenses companies that wish to manufacture and/or sell SD Memory Cards, including but not limited to flash memory, ROM, OTP, RAM, and SDIO Combo Cards SD-3C, LLC is a limited liability company established by Matsushita Electric Industrial Co. Ltd., SanDisk Corporation and Toshiba Corporation.
  1. PNM
The product name is a string, 5-character ASCII string.

How To Change Cid On Sd Card

  1. PRV
The product revision is composed of two Binary Coded Decimal (BCD) digits, four bits each, representing an
Sd card cid register“n.m” revision number. The “n” is the most significant nibble and “m” is the least significant nibble As an example, the PRV binary value field for product revision “6.2” will be: 0110 0010b
  1. PSN

CardThe Serial Number is 32bits of binary number.

Sd Card Cid Register


  1. MDT

The manufacturing date is composed of two hexadecimal digits; one is 8 bits representing the years(y) and the other is 4bits representing the month (m).

Sd Card Cid Reader


Sd Card Cid Rewriter

  1. CRC

CRC7 checksum (7 bits). This is the checksum of the CID contents computed as described in SD Specification.