Memory in Android devices, Types of memory

White paper Xperia™ E1 dual

Memory in Android™ devices

To use Android devices efficiently, users should be aware of the different types of device memory. This knowledge is important in order to understand, for example, where music, photos and videos are saved; how many apps can be downloaded from Google Play™; and how photos can be copied to a PC.

The below information is also of interest to developers who want to optimise their programs to make the best possible use of the resources in the device.

Generally, all Android devices share the same basic memory setup. What differs is how much memory is available to you via the different types of memory, and whether your device uses an external SD card or an internal memory chip. Any information specific to the particular device model described in this White Paper is noted as such.

Types of memory

The types of memory described and numbered below are consistent with the terminology used in Sony mobile device menus and in other content relating to 2014 Xperia™ devices:

1.Dynamic Memory (also known as RAM) is used by applications that run when the device is turned on. The amount of Dynamic Memory influences how many applications and operating system services can run at the same time. The Android operating system automatically closes applications and services that are not being used.

However, such automatic functionality has limits. For example, if a lower amount of free RAM is available to applications after a new release of the operating system (due to increased capabilities in the system), device speed will eventually be impacted. This is the main reason that a device cannot be indefinitely upgraded to newer releases of Android™.

If you experience problems with RAM, for example, if the device runs slower than usual or if the Home application restarts frequently when you leave an application, you should minimise the use of apps that run all the time. Such apps could include, for example, applications that frequently download social networking service updates. You could also consider using a static wallpaper instead of a live wallpaper.

To see which apps and services are currently active, go to Settings > Apps > Running. You should have at least 50 MB, and ideally 100 MB or more, of free RAM to avoid slowdowns and application restarts.

You should also be aware that if you update the device to a later Android release, the load on the built- in Dynamic Memory will increase due to the addition of more features, as mentioned above. As a result, the device may run slower after an update.

The Xperia™ E1 dual has about 512 MB of RAM available to the Android OS and applications, of which about 200 MB is already used out of the box.

2.System Memory (also known as “System partition” or “/system”) is used for the Android OS and for most applications that are pre-loaded from the factory. This type of memory is normally locked, and can only be changed through a firmware upgrade. There is usually some free space available in this section of memory. However, since it is locked, you cannot save apps, photos or any other content to this memory. System Memory is reserved for future firmware upgrades, which almost always need more memory than the original firmware. You cannot see or influence the use of this memory.

3.Internal Storage is memory used as” working” memory. It can be compared to the C: drive on a PC or to the startup disk on a Mac.

14	January 2014

D2104, D2105, D2114 specifications

Sony has made significant advancements in the realm of consumer electronics, particularly with its series of high-quality sound systems and audio devices. Among them, the D2114, D2105, and D2104 models stand out for their innovative features and exceptional sound quality, catering to audiophiles and casual listeners alike.

The Sony D2114 is designed with cutting-edge audio technology that ensures a rich and immersive listening experience. It is equipped with a powerful amplifier that delivers a clear and distortion-free sound across all frequency ranges. With a frequency response that covers a wide spectrum, from deep bass to crisp treble, users can enjoy various music genres with remarkable clarity. The D2114 also features Bluetooth connectivity, allowing users to stream music wirelessly from their devices, making it a perfect companion for both home and outdoor spaces.

Moving on to the D2105, this model takes sound quality to the next level with its advanced digital signal processing technology. This technology optimizes audio output, ensuring that every note is accurately reproduced. Additionally, the D2105 is equipped with a user-friendly interface, making it easy for users to navigate through their audio options. It includes multiple input options, including USB and aux, providing versatility for connecting various devices. The sleek design of the D2105 not only enhances its aesthetic appeal but also contributes to its robust sound performance.

Finally, the D2104 model excels in portability and convenience. This model is compact yet powerful, ideal for users who value sound quality but require a space-saving solution. The D2104 features a built-in rechargeable battery, allowing users to enjoy their favorite tunes on the go without being tethered to a power source. The model also boasts a durable build quality, making it suitable for outdoor use. The inclusion of a microphone is a thoughtful addition, enabling users to take calls directly through the device, promoting seamless communication.

In summary, the Sony D2114, D2105, and D2104 models each bring unique features and technologies to the table, ensuring an exceptional audio experience. From robust sound performance and advanced connectivity options to portability and user-friendly designs, these models reflect Sony's commitment to delivering high-quality audio solutions. Whether at home or on the move, these devices cater to diverse audio needs while maintaining the brand's reputation for excellence in the industry.