Unsourced material may be challenged and removed. All except the earliest digital computers are built with some form of minimal built-in loader, which loads a program or succession of programs from a storage medium, which then operate the computer. Linux usb device driver tutorial pdf a read-only medium such as punched tape or punched cards was used for initial program load.
This data may also include application and operating-system software, sometimes packaged and archived in compressed formats. Later, it was seen to be convenient and useful to boot the computer directly from compact disc, often with a minimal working system to install a full system onto a hard drive. While there are read-write optical discs, either mass-produced read-only discs or write-once discs were used for this purpose. CD itself would boot specifically, and only, to install onto a hard drive. CDs or “distros” were generally treated as a collection of installation packages that must first be permanently installed to hard disks on the target machine. GUI applications directly from a CD without disturbing the OS on the hard disk.
1998, was the first Linux distribution specially designed as a live CD. 1999, was the first Live CD to focus on system administration, and the first to be distributed in the bootable business card form factor. Live CD still in production. CD variant, which in some cases is also the preferred installation medium.
Live CDs are made for many different uses. Software can be tested, or run for a particular single use, without interfering with system setup. Although some live CDs can load into memory to free the optical drive for other uses, loading the data from a CD-ROM is still slower than a typical hard drive boot, so this is rarely the default with large live CD images, but for smaller live CD images loading the filesystem directly into RAM can provide a significant performance boost, as RAM is much faster than a hard drive, and uses less power. Experienced users of the operating system may also use a live CD to determine whether and to what extent a particular operating system or version is compatible with a particular hardware configuration and certain peripherals, or as a way to know beforehand which computer or peripheral will work before buying. Some live CDs can save user-created files in a Windows partition, a USB drive, a network drive, or other accessible media.
Live backup CDs can create an image of drives, and back up files, without problems due to open files and inconsistent sets. Several live CDs are dedicated to specific type of applications according to the requirements of thematic user communities. These CDs are tailored to the needs of the applications in subject including general knowledge, tutorial, specifications and trial data too. Some of these topics covers sub topics, e. IT administration breaks down to firewall, rescue, security, etc. In some cases a particular Live DVD covers more than one topic.
CD, or live ISO, can often be beneficial as a single image can run on both real hardware and on most types of virtual machines. Typically after booting the machine from the live CD, the appliance either runs in non-persistent demo mode or installs itself, at the user’s request, to an available storage device. ISO to be mounted as a volume. During live CD initialization, a user typically may resort to using one or more boot codes to change the booting behavior. 2 “live CDs” were specifically designed to run without installation onto other media like a hard disk drive. This came out of necessity to avoid requiring the user to configure the system each time it boots and to make it easily usable by those who are new to the operating system.
CD-ROM has the drawback of being unable to save any current working data. Puppy Linux and some other live CDs allow a configuration and added files to be written and used in later sessions. Boot loaders like syslinux can boot ISO files from USB memory devices. This page was last edited on 26 November 2017, at 14:38. This article is about bootstrapping operating systems.