Operating system kernels (like Linux) read the CID to apply specific "quirks" or optimizations tailored to a particular manufacturer’s silicon architecture. Using a CID Decoder
# CRC7 crc_byte = cid_bytes[15] >> 1 print(f"CRC7: 0xcrc_byte:02X")
A 7-bit checksum used to verify data integrity, paired with a 1-bit end token. How an eMMC CID Decoder Works
When decoding a CID, the first two characters (the first byte) indicate the manufacturer. Below are common hex identifiers found during decoding: Manufacturer 0x02 SanDisk / Western Digital 0x11 Toshiba / Kioxia 0x13 0x15 0x45 0x70 0x90 0xfe emmc cid decoder
mid = cid[0:2] # 0x15 (Kingston) oem = cid[2:6] # 0x0100 pnm = bytes.fromhex(cid[6:18]).decode() # "016G32" prv = cid[18:20] # 0xe0 → revision 1.0? psn = cid[20:28] # 0x3f5d9600 mdt = cid[28:32] # 0xb46d → year/mon decode
Specifies the intended use or customer for that specific batch.
#eMMC #EmbeddedSystems #HardwareHacking #DataRecovery #ReverseEngineering Operating system kernels (like Linux) read the CID
: The product revision is split into Major ( 1 ) and Minor ( 1 ), yielding revision 1.1 .
The eMMC CID decoder has several use cases:
The CID register is just one part of the eMMC standard. The JEDEC specification also defines other critical registers like the Card Specific Data (CSD), which describes the device's operational characteristics, and the Extended CSD (EXT_CSD), which contains advanced features and configuration options. For engineers and developers, understanding these registers is key to optimizing storage performance and reliability. Below are common hex identifiers found during decoding:
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