Internal SD Card Information
This device is designed for work with SD, SDHC & SDXC cards security features. It allows to read card CID, CSD numbers, lock and unlock card with password and set/remove write protection. Password protection: SD card locked with password is protected from any access to SD card data. Card must be unlocked first, to access data on it. Changeable cid sd card to solve your needs. Data storage is becoming more essential with advancing technology. Changeable cid sd card provide an excellent option for data storage and access. Changeable cid sd card are small in physical sizes, their capacity to store large amounts of data has increased significantly. Is there is any way to find cid of sd card in windows. Jun 12, 2018 #4 I was unable to find the CID as a single field. Jun 13, 2018 #5 jobeard said.
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). The CID register is set when the card is manufactured and cannot be changed after it is set. (According to SD card specification the information is only to be written once, however if a card does not conform to the specification this information could be changed!)
How to read the CID from an SD card
One way to read the CID is to use a laptop with an SD card slot. Card readers in laptops are usually connected directly through the PCI bus (or IDE bus). This will not work through a USB card reader because the command to retrieve the card information is intercepted and not understood by card readers. Not all computers with built-in card slots will work, some internal card readers are connected through a USB bus.
Assuming you have the proper hardware, there are several methods you can use to get the card information. With Linux, reading the internal SD card information is simple. Insert the card and look under /sys/block/mmcblk0/device/ (this location may change depending on your platform, it may be mmcblk1 or in a different location). Under this location you will see several attributes available that include the CID and CSD registers and the information inside it.
To view the CID, the command is cat /sys/block/mmcblk0/device/cid (the exact location may be different)
What information is in the CID?
The following information is stored in the CID:
| Name | Field | Linux attribute* | Description |
|---|---|---|---|
| Manufacturer ID | MID | manfid | Assigned by SD-3C, LLC. |
| OEM/Application ID | OID | oemid | Identifies the card OEM and/or the card contents. Assigned by SD-3C, LLC. |
| Product Name | PNM | name | 5 characters long (ASCII) |
| Product Revision | PRV | hwrev, fwrev | Two binary coded decimal (BCD) digits. Each is four bits. The PRV is in the form x.y. The PRV can also be found by using the hwrev and fwrev, where x=hwrev and y=fwrev |
| Serial Number | PSN | serial | This 32 bit field is intended to be read as an unsigned integer |
| Manufacture Date Code | MDT | date | Manufacture date is stored in the form yym (offset from 2000) |
| CRC7 checksum | CRC | 7 bit code used for checking errors in the card register |
* these are the attribute titles used for the card in Linux
For more information, refer to the SD Association Simplified Specifications.
List of Common Manufacturer ID (MID)
Manufacturer ID (MID) are assigned by the SD Assoication (SD-3C LLC). They consider this information confidential so an official list is not published.
The following list was compiled by reading the CID on numerous SD cards. Many card brands are produced by OEM suppliers, and the MID and OEMID may reflect this, or in some cases they appear to show the producer of the card controller. For example, PNY cards have been found with 0x000028 and BE (Lexar) or 0x000027 and PH (Phison).
| Company | MID | OEMID | Card brands found with this MID/OEMID |
|---|---|---|---|
| Panasonic | 0x000001 | PA | Panasonic |
| Toshiba | 0x000002 | TM | Toshiba |
| SanDisk | 0x000003 | SD (some PT) | SanDisk |
| Samsung | 0x00001b | SM | ProGrade, Samsung |
| AData | 0x00001d | AD | AData |
| Phison | 0x000027 | PH | AgfaPhoto, Delkin, Integral, Lexar, Patriot, PNY, Polaroid, Sony, Verbatim |
| Lexar | 0x000028 | BE | Lexar, PNY, ProGrade |
| Silicon Power | 0x000031 | SP | Silicon Power |
| Kingston | 0x000041 | 42 | Kingston |
| Transcend | 0x000074 | JE or J` | Transcend |
| Patriot(?) | 0x000076 | �� | Patriot |
| Sony(?) | 0x000082 | JT | Gobe, Sony |
| 0x00009c | SO | Angelbird (V60), Hoodman | |
| 0x00009c | BE | Angelbird (V90) |
How can I use the information from the CID?
The CID information can be helpful in identifying counterfeit memory cards. We include the CID data in our SD card reviews so you may compare it with your cards.
SD cards are commonly used in Android devices, digital cameras and many other 3C products. When SD cards are write-protected, you can only read what's inside but not able to add more files in it. How to write files to those SD cards again? We provide 2 solutions on this: using diskpart command line to clean SD card and reformat; using third-party software Partition Expert to wipe SD card and initialize it again.
Using diskpart to clean SD Card when write-protected
You can run diskpart command prompt by the following methods:
- Press Windows key + R to open RUN box, and type diskpart and press Enter to run;
- Click Start bottom, type CMD in Cortana, or the search box, run command prompt (admin); and type diskpart to open it;
OK, when your opened diskpart, type the following commands in order:
- Type
list disk - Type
select disk 1 - Type
attributes disk clear readonly
Now you have a clean SD card with nothing in it, the space becomes unallocated, so you format it and reuse it again. Just run disk management, the build in tool in Windows 10, and right-click unallocated space, follow the guide wizard.
This time you can write files to the SD card again, but if you want to erase everything in this card, you can do like this: 1. Type List disk > 2. Type Sel disk 1 > 3. Type clean all; now have an empty card, you have to initialize it and format it again for later use.
Check what the definition of Clear command from Microsoft is:
clear
Clears the specified attribute (hidden, read-only, nodefaultdriveletter, or shadowcopy volume) from the selected volume.
Partition Expert to wipe SD Card when write-protected
The command clean is quick but data can still be recovered from professionals, if you want to give your SD card to other or just donate it, clean is not enough, you need to wipe everything out, to protect your personal information. Here are the steps to wipe SD card when write protecting:
Download Partition Expert Free Edition, install (you can choose install package between 32 bit and 64 bit), and Run;
Click SD card in the disk map, and click Wipe Disk in the operations column;
Choose a wiping method from the list, click OK;
Sd Card Cid Reader
Type WIPE in the popup window and click OK to wipe;
Wipe disk theory: rewrite each sector with zero, one, or zero&one, or other methods, which makes recovery imposable. In this way, you get a RAW SD card, which must be initialized before use.
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