Abstract: A main memory system includes a main memory device including a first memory device implemented with a volatile memory and a second memory device implemented with a non-volatile memory, the main memory system being configured such that, when entering a sleep mode, the memory device reads a portion of data stored in the first memory device to store the read data in the second memory device, and, after the portion of data is read, the first memory device and the second memory device are powered off.

Abstract: A memory card includes a card body, an interface terminal and an attachment mechanism for detachably mounting the card to an adaptor of an electronic device. The interface terminal is disposed at a central portion of a major surface of the card body. The attachment mechanism is located at an outer peripheral portion of the card body that surrounds the central portion. The adaptor has a recess whose shape complements that of the major surface of the card body, and socket exposed at a central portion of the bottom of the recess. Thus, the memory card may be inserted face down into the adaptor.

Abstract: A main memory system includes a main memory device including a first memory device implemented with a volatile memory and a second memory device implemented with a non-volatile memory, the main memory system being configured such that, when entering a sleep mode, the memory device reads a portion of data stored in the first memory device to store the read data in the second memory device, and, after the portion of data is read, the first memory device and the second memory device are powered off.

Abstract: A memory card includes a card body, an interface terminal and an attachment mechanism for detachably mounting the card to an adaptor of an electronic device. The interface terminal is disposed at a central portion of a major surface of the card body. The attachment mechanism is located at an outer peripheral portion of the card body that surrounds the central portion. The adaptor has a recess whose shape complements that of the major surface of the card body, and socket exposed at a central portion of the bottom of the recess. Thus, the memory card may be inserted face down into the adaptor.

Abstract: A memory module and a memory system are provided. The memory module includes a first circuit board on which at least one memory chip is mounted, a second circuit board on which at least one memory chip is mounted, and a flexible coupler electrically connecting the first circuit board to the second circuit board. The memory module is bendable and is configured to extend around a memory controller. The memory chips are electrically coupled with the memory controller via a respective plurality of signal lines. The bendable memory module is configured to be bent around the memory controller such that respective lengths of the signal lines are equal.

Abstract: A memory module and a memory system are provided. The memory module includes a first circuit board on which at least one memory chip is mounted, a second circuit board on which at least one memory chip is mounted, and a flexible coupler electrically connecting the first circuit board to the second circuit board. The memory module is bendable and is configured to extend around a memory controller. The memory chips are electrically coupled with the memory controller via a respective plurality of signal lines. The bendable memory module is configured to be bent around the memory controller such that respective lengths of the signal lines are equal.