Linux secure digital
Linux – secure digital life #43
Via /dev/mmcblkid, SD/MMC cards that use the MMC subsystem can be accessed as a block computer. Normally, the kernel parses the partition table and exports the card’s partitions using the appendix px, such as /dev/mmcblkidpx.
Until attempting to enable this function, make sure your carrier board does not pull-up any of the MMC, MMC1, or SD1 signals to 3.3 volt (e.g. delete R46 to R54 for 8-bit or R29 to R32 and R39 for 4-bit SD/MMC slot on our Apalis Evaluation Board V1.1A).
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The innovation relates to a method for creating a virtual SD (Security Digital) card on an Android computer. The steps in the process are as follows: 1) loading a partitioned mirror image document into the device’s Flash memory or hard disk; 2) locating idle Loop equipment in the device’s android system; 3) sending a user space adding message to the Loop equipment through the android system’s Linux kernel, allowing the android system to recognize the Loop equipment as disk equipment; 4) correlating the Loop equipment with the part The method has advantages over the traditional method of the android system’s virtual SD card, such as ease of deployment, good adaptability, and protection, among others.
The SD card is commonly used in cell phones, and in relatively stationary equipment for use occasions such as a navigating instrument or a set-top box, many irrational parts are arranged: (1) Larger internal storage space in (1) this type of equipment, and the SD card wants high in comparison to the paster Flash of same memory space or the cost of SATA hard disk, and this will undoubtedly increase the manufacturing cost of equipment; (2) need to so not only increase the difficulty of hardware design for the SD card by adding specific hardware driving chip, and reserving slot for it whe Based on the above considerations, virtual SD cards may be used to replace true SD cards in navigation instruments and other set-top box equipment.
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Is it possible to insert your card reader into another device and read the same SD card there? To be clear, I can put SD cards into the (built-in) card reader on my laptop running Helena and they mount automatically.
The SD-card is in a Nikon Coolpix L15, and I can get the pictures from the camera using a USB cable from the camera to the device, but the issue arises when I insert the SD-card into the reader’s slot.
HG, I did some research and it appears that some users are experiencing similar issues with SD cards in USB readers and the new version of Ubuntu, which Helena is focused on. Please insert the SD card into the reader, then open a terminal window and type dmesg | tail, then sudo fdisk -l (lowercase L), and post the results here.
ej64 may be right. The dmesg output indicates that the 4GB card is simply not being detected, which may suggest a problem with the card reader reading that specific card rather than a Mint issue. I guess the only way to be sure is to test it on a different computer with a different operating system. Some users have had success by booting with the reader unplugged and then plugging it in once logged in, according to some of the threads I’ve read on this, but given that it’s an internal computer, I can’t suggest it. Since USB readers are relatively inexpensive, buying another reader could be your best choice. Good luck, and please let us know if you get it to function so that other users can benefit as well.