Flash-based memory cards nowused everywhere. This method of storing information is much more convenient than other alternatives, which explains its popularity. The absence of moving parts, high speed, long service time - this is not a complete list of the advantages of flash drives. Moreover, if the card reader does not see the memory card, then at first it is difficult to believe. The main thing - do not panic and calmly try to recover. There are several reasons due to which the card reader does not see the memory card. In this paper, we present their description and recommendations for elimination.
A card reader is a device thatthrough which you can work with flash memory cards. It performs two functions: recording (including formatting) and reading information. Inside there is a controller and a group of sliding contacts. Card readers can be both internal embedded and external. By the way, mobile phones that use memory cards also have their own card reader. Therefore, if such a built-in card reader does not see the memory card, then you need to look for the reason in it, and not in the phone.
Currently the market offers a wide selectionvarious types of flash memory cards: SD, miniSD, MMC, xD, etc. Among themselves, they differ in the number of contacts involved and their location, shape, speed of operation and level of energy consumed. In some cases, the differences are more trivial - dimensions. So, often with the help of a simple adapter, you can use SD cards in devices for MMC. It is not surprising that users sometimes have to figure out why the card reader does not see the card. After all, the cards have their own characteristics.
One of the most common reasons forwhich the card reader does not see the memory card is the incompatibility of standards. The specification for any card reader (even built-in) always indicates the supported types of flash memory cards. Unfortunately, the reality is that the instructions are almost never read. Many believe that if the card fits into the connector for reading, then there will be no problems. This is not true. For example, currently there are two types of SD (Secure Digital) standard cards: standard SD with a maximum capacity of 2 GB and its enhanced version of SDHC (Secure Digital High Density Recording). The capacity of the latter can be 32 GB. They are identical in size and location of contacts! The difference lies in the mechanism of addressing memory pages: in SD - byte-byte, and in SDHC - sector-by-sector. If you insert an SDHC memory card into an SD device, you will not be able to work with it. Either it will not be determined at all, or there will be permanent failures. From here, if the card reader does not see the memory card, then you need to check that the device and the card are compatible.
When using an adapter (SD - MMC)It is necessary to check the status of contacts with a flashlight. Sometimes, even with careful use, internal spring-loaded contacts in the adapter “break in” with the inserted card. In this case, you need to change the adapter.
If there are problems with the performance on the computercheck the status of BIOS settings. USB ports must be enabled (Enabled), and, if the function is provided, then in USB 2.0 mode. Also, if there is a “Legacy USB”, then it should be used. In any case, when you connect the card reader to the computer, the safe removal icon should appear next to the clock in the system tray (for Windows). If it is missing, then you need to temporarily disconnect unnecessary USB devices and check the card reader. And, finally, make sure it works on another computer. You may have to change the device to a newer version.
