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Memory Stick Micro

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Memory Stick Micro

This article is about Sony's proprietary memory format. For the mobile USB storage device, see USB flash drive.
Memory Stick
From top to bottom: Memory Stick PRO, Memory Stick PRO Duo, Memory Stick Micro (M2)
Media type Flash Memory Card
Capacity 4 MB to 256 GB (maximum theoretical size: 2 TB)
Developed by Sony
Extended to Memory Stick PRO, Memory Stick Duo, Memory Stick Pro Duo, Memory Stick PRO-HG Duo and Memory Stick Micro

Memory Stick is a removable flash memory card format, launched by Sony in October 1998,[1] and is also used in general to describe the whole family of Memory Sticks. In addition to the original Memory Stick, this family includes the Memory Stick PRO, a revision that allows greater maximum storage capacity and faster file transfer speeds; Memory Stick Duo, a small-form-factor version of the Memory Stick (including the PRO Duo); and the even smaller Memory Stick Micro (M2). In December 2006 Sony added the Memory Stick PRO-HG, a high speed variant of the PRO to be used in high-definition video and still cameras. Memory Stick cards can be used in Sony XDCAM EX camcorders via the MEAD-SD01 adapter.[2]


The original memory stick was launched in October 1998, was available in sizes up to 128 MB, and a sub-version, Memory Stick Select allowed two banks of 128 MB selectable by a slider switch, essentially two cards squeezed into one. The largest capacity Memory Sticks currently available is 64 GB. According to Sony, the Memory Stick PRO has a maximum theoretical size of 2 TB.[3]

As of January 2010, it appears that Sony is beginning to combine support for SD/SDHC and Memory Stick formats in their products. All digital cameras and camcorders announced by Sony at the 2010 Consumer Electronics Show can use SD and SDHC cards as well as Memory Sticks.[4][5][6][7][8] Furthermore, Sony is releasing its own line of SD cards.[9] Many claim this development as the end of the format war between Memory Stick and SD card. However, Sony has not abandoned the format, and has indicated it will continue development of the format for the foreseeable future. A prime example is the development of WiFi transfers through a special Memory Stick Pro-Duo which is still in development.[10][11][12][13][14][15][16]


Typically, Memory Sticks are used as storage media for a portable device, in a form that can easily be removed for access by a personal computer. For example, Sony digital compact cameras use Memory Stick for storing image files. With a Memory Stick-capable Memory card reader a user can copy the pictures taken with the Sony digital camera to a computer. Sony typically includes Memory Stick reader hardware in its first party consumer electronics, such as digital cameras, digital music players, PDAs, cellular phones, the VAIO line of laptop computers, and the PlayStation Portable.

A special Memory Stick can be inserted in the hindquarters[17] of Sony's AIBO robot pet, to enable the use of Aiboware—software intended for use on AIBOs. The Sticks include a copy protection mechanism used by the robot, allowing users to write programs. These are referred to as programmable or programming. Only 8 MB and 16 MB versions are available.

Formats and form factors

Memory Sticks include a wide range of actual formats, including three different form factors.

Memory Stick

The original Memory Stick is approximately the size and thickness of a stick of chewing gum. It was available in sizes from 4 MB to 128 MB. The original Memory Stick is no longer manufactured.

Memory Stick Select

In response to the storage limitations of the original Memory Stick, Sony introduced the Memory Stick Select. The Memory Stick Select was two separate 128 MB partitions which the user could switch between using a (physical) switch on the card. This solution was fairly unpopular, but it did give users of older Memory Stick devices more capacity. Its size was still the same as the original Memory Stick.

Memory Stick PRO

The Memory Stick PRO, introduced in 2003 as a joint effort between Sony and SanDisk,[18] would be the longer-lasting solution to the space problem. Most devices that use the original Memory Sticks support both the original and PRO sticks since both formats have identical form factors. Some readers that were not compatible could be upgraded to Memory Stick PRO support via a firmware update. Memory Stick PROs have a marginally higher transfer speed and a maximum theoretical capacity of 32 GB, although it appears capacities higher than 4 GB are only available in the PRO Duo form factor. High Speed Memory Stick PROs are available, and newer devices support this high speed mode, allowing for faster file transfers. All Memory Stick PROs larger than 1 GB support this High Speed mode, and High Speed Memory Stick Pros are backwards-compatible with devices that don't support the High Speed mode. High capacity memory sticks such as the 4 GB versions are expensive compared to other types of flash memory such as SD cards and CompactFlash.

Memory Stick Duo

The Memory Stick Duo was developed in response to Sony's need for a smaller flash memory card for pocket-sized digital cameras, cell phones and the PlayStation Portable. It is slightly smaller than the competing Secure Digital (SD) format and roughly two thirds the length of the standard Memory Stick form factor, but costs more. Memory Stick Duos are available with the same features as the larger standard Memory Stick, available with and without high speed mode, and with and without MagicGate support. The Memory Stick PRO Duo has replaced the Memory Stick Duo due to its 128 MB size limitation, but has kept the same form factor as the Duo.

A simple adapter allows Memory Stick Duo to be used in devices designed to accept the original Memory Stick form factor.

Memory Stick PRO Duo

The Memory Stick PRO Duo (MSPD) quickly replaced the Memory Stick Duo due to the Duo's size limitation of 128 MB and slow transfer speed. Memory Stick PRO Duos are available in all the same variants as the larger Memory Stick PRO, with and without High Speed mode, and with and without MagicGate support.

Sony has released two different versions of Memory Stick PRO Duo. One is a 16 GB version on March 2008 and other is a 32 GB version on August 21, 2009.[19] In 2009 Sony and SanDisk also announced the joint development of an expanded Memory Stick PRO format tentatively named "Memory Stick PRO Format for Extended High Capacity" that would extend capacity to a theoretical maximum of 2 terabytes.[20] Sony has since finalized the format and released its specification under the new name, Memory Stick XC.[21]

Memory Stick PRO-HG Duo

On December 11, 2006, Sony, together with SanDisk, announced the Memory Stick PRO-HG Duo. While only serial and 4-bit parallel interfaces are supported in the Memory Stick PRO format, an 8-bit parallel interface was added to the Memory Stick PRO-HG format. Also, the maximum interface clock frequency was increased from 40 MHz to 60 MHz. With these enhancements, a theoretical transfer rate of 480 Mbit/s (60 Mbyte/s) is achieved, which is three times faster than the Memory Stick PRO format.

Memory Stick Micro (M2)

In a joint venture with SanDisk, Sony released a new Memory Stick format on February 6, 2006. The Memory Stick Micro (M2) measures 15 × 12.5 × 1.2 mm (roughly one-quarter the size of the Duo) with 64 MB, 128 MB, 256 MB, 512 MB, 1 GB, 2 GB, 4 GB, 8 GB, and 16 GB capacities available. The format has a theoretical limit of 32 GB and maximum transfer speed of 160 Mbit/s. However, as with the PRO Duo format, it has been expanded through the XC series as Memory Stick XC Micro and Memory Stick XC-HG Micro, both with the theoretical maximum capacity of 2 TB.[21]

The M2 comes with an adapter, much like the Duo Sticks, to ensure physical compatibility with Memory Stick PRO devices. However, not all devices with a PRO slot are compatible with the M2/Adapter combination, as the firmware of older devices don't support the higher capacity of some M2 cards. One example is certain Sony CLIÉ PDAs which don't support cards larger than 2 GB.[22]

Sony announced on June 1, 2009 that M2 support in Sony Ericsson phones would be dropped in favor of microSD.[23]

Memory Stick XC

On January 7, 2009, SanDisk and Sony announced the Memory Stick XC format (tentatively named "Memory Stick Format Series for Extended High Capacity" at the time).[24] [25] The Memory Stick XC has a maximum 2 TB capacity, 64 times larger than that of the Memory Stick PRO which is limited to 32 GB. XC series has the same form factors as PRO series, and supports MagicGate content protection technology as well as Access Control function as PRO series does. In line with the rest of the industry, the XC series uses the newer exFAT file system due to size and formatting limitations of FAT/FAT16/FAT32 filesystems used in the PRO series.[26][27] A maximum transfer speed of 480 Mbit/s (60 Mbyte/s) is achieved through 8-bit parallel data transfer.[28]

Memory Stick PRO-HG Duo HX

Sony announced the release of the Memory Stick PRO-HG Duo HX on May 17th, 2011 which was considered the fastest card ever made by the manufacturer. It measures 20 x 31 x 1.6 mm, with 8 GB, 16 GB or 32 GB versions available. Also, the format offers a maximum transfer speed of 50 MB per second. [29]

Mark 2 Certification

As of early 2008, Mark 2-certified versions of the Memory Stick PRO Duo became available. The Mark 2 designation indicates the Memory Stick is suitable for use with AVCHD recording products or other faster Memory Stick enabled devices by providing appropriate minimum write performance.[30]

See also


External links

  • Sony's official One Stop Site for Formats, with some specifications of the electrical interface.
  • Memory stick products at Sony Singapore.
  • SanDisk and Sony develop “Memory Stick Micro” (M2) format – SanDisk/Sony press release, September 30, 2005.
  • SanDisk and Sony announce "Memory Stick Pro-HG" (HG) format – December 1, 2006.
  • Complete Memory Stick® Media Compatibility Information for Sony® Digital Cameras Sony eSupport July 2011.

Template:Memory Cards

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