sda books

PBOC/EMV has two very important concepts,SDA (static data authentication) and DDA (Dynamic Data authentication), respectively called Static data authentication and Dynamic Data authentication . These two certifications are certified offline (off-line) .　　the principle of SDA implementation is digital signature . The process is as follows: The data in the IC card first sign, it is to use a hash to generate

Article Title: Linux disk device files (sda, sdb, sdc ....) Change issues. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. In Linux, this problem often occurs. In some cases, the disk device files, such as/dev/sda, sdb, and sdc, are messy, for example, if

Reprinted please indicate the sourceAuthor: Pony Before reading this article, we recommend that you understand the working principles of asymmetric encryption and decryption. SDA means static data authentication. First, how to understand this static data. Static card data is used for authentication, and the data will not be changed after the card is personalized, such as the card number. it aims to confirm the validity of key static data identified b

1. Please check the information to understand these terms:/dev/hda,/dev/hdb,/DEV/SDA,/dev/sdb, what is the difference between them?A: Hda generally refers to the IDE interface of the hard disk, HDA refers to the first hard disk, HDB refers to the second hard disk, etc.; SDA refers to the SATA interface of the hard disk, SDA refers to the first hard disk, SDB refe

When CentOS6.5 is installed, the system prompts "sda must have a GPT disk label" I encountered two problems in installing CentOS6.5 on thinkpad t430u today. 1> when centos6.5 is installed on a USB flash drive, the following error message is displayed: ACPI: BIOS _ OSI (Linux) query ignored. 2> after the partition is complete, When you click "Next", the system prompts that the sda must have a GPT disk la

When installing the CentOS 6.4 system, the system always fails when detecting the hard Disk. The error is as follows: Disk sda contains bios raid metadata, but is not part of any recognized bios raid sets. ignoring disk sda. As shown in: In addition, the hard disk displays occasional/dev/sda and occasional/dev/sdb ..From the prompt, it seems that the hard disk

. multiple consecutive logical partitions can be used as an extended partition. One hard disk can only have one extended partition.Summary: In other words, there are still up to four primary partitions and extended partitions on a physical hard disk. However, extended partitions can be further divided into logical partitions. for most users, there is no difference in the use of primary and logical partitions. In this way, a fast hard disk can have almost unlimited partitions. Partition instance

CENTOS7 Boot does not enter the graphical interface, there is SDA assuming drive cache write through, no valid RAPL domains found in the package and other information.The problem was that I was operating in VMware because the CentOS system was unable to appear in the Hgfs folder when I was using the file sharing feature between the virtual machine and the physical machine.In order to solve the problem of Hgfs, I refer to the following posts:http://blo

I2C transmits data between devices connected to the bus using only two wires (SDA and SCL. each device is identified by a unique address (whether it is a microprocessor, LCD driver, memory, or keyboard interface) and can be used as a sender or receiver based on the functions of the device. the LCD driver may be a receiver, while the memory can send and receive data. in addition to transmitters and receivers, the device can act as a host or slave when

Solution to Disk sda contains bios raid metadata When CentOS6.2 is installed today, when the hard disk is detected, the following error is reported: DisksdacontainsBIOSRAIDmetadata, butisnotpartofanyrecognizedBIOSRAIDsets. Ignoringdisksda This situation is similar in Ubuntu and SUSE, but the prompts are not the same. Sometimes sda or sdb. I think this hard disk was raid and I don't recognize it now. What

Prompt when installing CentOS 6.5: SDA must have a GPT disk labelDo the following to resolve:When the partition is not being partitionedPress CTRL + ALT + F2 to enter rescure modePartedmklabelgpt/dev/sdayesprint/dev/sdaPress CTRL + ALT + F6 back to the installation screenThen partition and other operations, can be completed successfully.This article is from "The girl said" blog, please be sure to keep this source http://sugarlovecxq.blog.51cto.com/670

==================================================== =========================install1package (s) Totaldownload size:595kinstalledsize:2.1misthisok[y/n]:ydownloadingpackages: parted-2.1-25.el6.i686.rpm |595kB 00:16Runningrpm_check_debugRunningTransaction testtransactiontestsucceededrunningtransactioninstalling:parted-2.1-25.el6.i686 1/ 1verifying:parted-2.1-25.el6.i686 1/1Installed:parted.i6860:2.1-25.el6 complete!Once the installation is complete, the query is made again and the installatio

Some time ago, the Linux kernel was compiled. Online documents all said that after compilation, Lilo was modified. config, which has a section of configuration: Root =/dev/hda2. Check my own lilo configuration, as if it should be SDA. I checked the differences between hda and SDA on the Internet and picked up the explanations on the English forum. IDE Hard Disks (well, devices, actually) are HD The standa

Label:In Linux, often encounter such a problem, disk equipment files, such as/DEV/SDA, SDB, SDC and so on in some cases will be confused, such as SDA into SDB or SDC into SDB and so on, which will virtually lead to the chaos of disk device management, The most common example of Linux file system startup issues. Many people in this situation to find disk, array manufacturers, suspect is their problem, in fac

Today in the installation of CentOS 6.2, when the detection of the hard disk, always pass, error is as follows: Disk SDA contains BIOS RAID metadata, but was not part of the any recognized BIOS RAID sets. Ignoring disk SDAThis situation has a similar situation in Ubuntu,suse, but the hints are not quite the same.Sometimes it's SDA, sometimes sdb.The feeling is that this hard drive was previously raid, and n

Today installs the CentOS6.5 to the completion area, presses the next time to prompt SDA must have a GPT disk label, cannot continue installs. Baidu a bit, this time need to build a GPT tag, as follows:1, in the current interface press CTRL+ALT+F2 key combination, enter the command lineInput partedInput Mklabel GPT/DEV/SDAThen enter YesUse PRINT/DEV/SDA for confirmationPress CTRL+ALT+F6 to return to the ins

Linux view areas that are already well-divided[Email protected] ~]# fdisk-l/DEV/SDAdisk/dev/sda:21.5 GB, 21474836480 bytes255 heads, Sectors/track, 2610 cylindersUnits = Cylinders of 16065 * 8225280bytesSector size (logical/physical): bytes/512 bytesI/O size (minimum/optimal): bytes/512bytesDisk identifier:0x7d57cb1fDevice Boot Start End Blocks Id System/DEV/SDA1 1 2610 20964793+ 5 Extended/dev/sda5 1 1028097 Linux/dev/sda6 129 1028128+, Linux/DEV/SDA

Error: SDA must has a GPT disk label or Boot/efi is needed, on EFI enablewd machine, it's need that disklabel of the boot device is GPT. Workaround:1. Press CTRL+ALT+F2 to enter the command line2. Enter PARTED/DEV/SDA, enter parted status,3. Enter Mklabel, carriage return, enter PGT, return, prompt all data will be deleted, enter Yes4. Press CTRL+ALT+F6 to return to the graphical interface, click "Back", th

1, when entering the installation interface, also appears in the graphical interface, the command to it first create GPT--Press CTRL+ALT+F2 's key combination, then go to the command line--Do the followingInput partedInput Mklabel GPT/DEV/SDAIn the prompt screen, enter YesUse PRINT/DEV/SDA for confirmationPress CTRL+ALT+F6 to return to the installation screen2, again in order to install, re-partition the hard disk, successfully passedPC installation c

When centos 6.2 is installed today, when the hard Disk is detected, the following error is reported: Disk sda contains bios raid metadata, but is not part of any recognized bios raid sets. ignoring disk sda found a solution on the Internet. After testing, the hard disk was finally detected! You can perform the next installation! Www.2cto.com: press the TAB key to go to the installation and selection menu. T