Read-only Definition
A read-only file or storage device contains data that cannot be modified or deleted. While data can be accessed or "read" from a read-only file or device, new data cannot be added or "written" to the device.
Most operating systems, such as Windows and OS X allow you to mark individual files as read-only. In Windows, you can right-click a file and select Properties to view more information about the file. You can click the Read-only checkbox (located in the General ta...
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SD Cards
SD Definition
SD Definition
Stands for "Secure Digital." SD is a type of memory card used to store data in portable electronic devices. Examples include digital cameras, video recorders, smartphones, and portable music players. SD cards are considered removable storage (instead of internal or external storage), since they can be inserted and removed from a compatible device.
The first SD cards were introduced in 1999. They used almost the same form factor as the existing MultiMediaCard (MMC) format, b...
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