Last year, it was reported that if the screen of the iPhone 7 was replaced by a third party, the touch ID would not work well. A similar situation has appeared on the iPhone 8 now. Recently, some iPhone 8 users reported that they could not be used under the iOS 11.3 system after the third-party manufacturer changed the screen. Similar to last year, it seems that Apple has adopted a customized screen matching chip. If it is a third-party repair screen, you must upgrade the chip, otherwise iOS will disable all touch input from the device. It is not clear whether Apple will fix this problem. Some third-party repair points have indicated that they will not replace the screen for the iPhone 8 device, which may be the problem. Changing the screen causes the Touch ID to fail. It is understandable. After all, this involves fingerprint authentication. It is a bit outrageous to change the screen and cause the screen touch to fail. In addition, third-party repair points also complained that the iPhone X has a similar situation. If the ambient light sensor or the front camera is replaced, the face ID will be banned.
Small computer system interface (SCSI) is an independent processor standard for system level interfaces between computers and intelligent devices (hard disks, floppy drives, optical drives, printers, scanners, etc.). SCSI is an intelligent universal interface standard.
1. SCSI can support multiple devices, SCSI-2 (fastscsi) can connect up to 7 SCSI devices, and widescsi-2 can connect 15 SCSI devices. In other words, all devices only need to occupy one IRQ. At the same time, SCSI also supports a wide range of devices, such as CD-ROM, DVD, CDR, hard disk, tape drive, scanner, etc. SCSI-180°DIP Section ShenZhen Antenk Electronics Co,Ltd , https://www.antenkelec.com
2. SCSI also allows one device to transfer data and another device to look up its data. This can achieve higher performance in multitasking operating systems such as Linux and windows NT.
3. SCSI occupies a very low CPU, so it has obvious advantages in multitask system. Since the SCSI card itself has a CPU, it can handle all the transactions of SCSI devices. When the host CPU sends work instructions to the SCSI card, the SCSI card will work by itself. After the work is finished, the work results will be returned to the CPU. In the whole process, the CPU can carry out its own work.
4. The SCSI device is also intelligent. The SCSI card can queue CPU instructions by itself, which improves the work efficiency. In multitasking, the hard disk will be in the current head position, and the adjacent tasks will be completed first and then processed one by one.
5. The fastest SCSI bus has a bandwidth of 160MB / s, which requires the use of a 64 bit 66MHz PCI slot. Therefore, the maximum speed that can be achieved in the PCI-X bus standard is 80mb / s. if it is used with a dedicated hard disk with 10000rpm or 15000rpm, it will bring obvious performance improvement.