Emmc Cid Decoder !link! [2026 Update]
| MID (hex) | Manufacturer | | :--- | :--- | | 0x02 | Sandisk / Western Digital | | 0x03 | Toshiba (now Kioxia) | | 0x11 | Samsung | | 0x13 | Micron | | 0x1C | Hynix (SK Hynix) | | 0x45 | Kingston |
If you are working with an Android device via ADB shell, an embedded Linux board, or a Raspberry Pi, run the following command: cat /sys/block/mmcblk0/device/cid Use code with caution.
This chip is a 4GB eMMC manufactured in February 2011. If your device expects a 32GB eMMC, you now know it has been swapped. Additionally, an old manufacturing date suggests the chip may have worn-out NAND cells, explaining boot failures.
Standard USB card readers usually block access to raw registers. To read the CID, you typically need a native interface ripitapart.com MultiCID Decoder
: byte offset counts from most significant byte (byte 15) to least (byte 0). Many decoders use 0‑based array indexing starting at CID[0] = MSB. emmc cid decoder
The most straightforward method in a Linux environment is to query the sysfs interface directly. The command cat /sys/block/mmcblk0/device/cid will output the CID in a raw hexadecimal string.
Do you have a specific CID string you're trying to parse, or
Developers often need the CID to identify specific hardware "stepping" or revisions to ensure they are flashing the correct bootloader or kernel. How to Use an eMMC CID Decoder
def decode_emmc_cid(cid_hex): cid_bytes = bytes.fromhex(cid_hex) # Extract fields (simplified) mid = cid_bytes[0] pnm = cid_bytes[3:9].decode('ascii', errors='ignore').strip() psn = int.from_bytes(cid_bytes[10:14], byteorder='big') mdt_year_month = cid_bytes[14] year = 2000 + ((mdt_year_month >> 4) & 0xF) month = mdt_year_month & 0xF print(f"Manufacturer ID: 0xmid:02X") print(f"Product Name: pnm") print(f"Serial Number: psn") print(f"Manufactured: year-month:02d") | MID (hex) | Manufacturer | | :---
If the device is functional and runs a Linux-based operating system (such as Android or embedded Linux), you can read the CID directly from the sysfs virtual filesystem. Open a terminal or ADB shell and run: cat /sys/block/mmcblk0/device/cid Use code with caution.
Embedded software developers use the CID to implement manufacturer-specific workarounds. If a certain silicon revision from a specific vendor suffers from a known hardware bug, the device firmware can read the CID at boot time and dynamically apply a patch. How to Retrieve the Raw CID String
Most modern decoders exist as web-based tools or command-line utilities. A user typically retrieves the raw CID string from a device (for example, via /sys/block/mmcblkX/device/cid in Linux) and pastes it into the decoder. The software then performs bitmasking and ASCII conversion to present a structured table of the chip's internal identity.
JEDEC assigns 0x15 to Samsung . (Other common IDs include 0x90 for SK Hynix, 0x45 for SanDisk, and 0x13 for Micron). Step 2: Extract the Product Name (PNM) Additionally, an old manufacturing date suggests the chip
Verifies if the internal silicon matches the laser etching on the chip's exterior.
The Card Identification (CID) register is a crucial component of Embedded MultiMediaCard (eMMC) storage. It contains unique manufacturing and hardware data. An eMMC CID decoder translates this raw binary or hexadecimal string into human-readable information. This data is vital for device forensics, hardware repair, and counterfeit detection. What is an eMMC CID?
Specifies the intended use or customer for that specific batch.
Cross-referencing the JEDEC factory assignment table reveals that 0x15 belongs to Samsung . (Other common IDs include 0x13 for Micron, 0x45 for SanDisk, and 0x90 for SK Hynix).