ISO 9660

ISO 9660 defines a file system for CD-ROM media. It aims at supporting different computer operating systems such as Microsoft Windows, Mac OS, and systems that follow the Unix specification, so that data may be exchanged. Each of the existing file systems for magnetic media contain various features which can not be represented on CD-ROM media using an unenhanced version of ISO 9660. Some of the ISO 9660 problems which are addressed by this specification include: 1. Character Set limitations; 2. File Name Length limitations; 3. Directory Tree Depth limitations; 4. Directory Name Format limitations; 5. Wide Character (16-bit character) ambiguities. There are common extensions to ISO 9660 to deal with the limitations. Rock Ridge supports the preservation of Unix/Linux permissions and longer ASCII-coded names; Joliet supports names stored in Unicode, thus allowing almost any character to be used, even from non-Latin scripts; El Torito enables CDs to be bootable on PC. Joliet: extension of the ISO9660 format used on Windows to support long filenames, etc Rock Ridge: extensions of the ISO9660 format used on UNIX to support long filenames and permissions, etc. Many software packages can create hybrid CDs that will work in many of the preceding formats without requiring data to be duplicated. For example, an ISO/HFS/Joliet/Rockridge hybrid will contain filename information for Macs, Windows, and linux machines.

Ports

Un port es una dirección interna dentro de una máquina compuesta por 2 bytes (2^16 = 65535 ports). Dos tipos de ports: TCP y UDP. Ports desde el 0 al 1023 están reservados para servicios estándares del TCP ("well-known ports"). Sólo son accesibles para el usurio root. El archivo "etc/services" contiene una lista de los ports y los programas que los usan.

GPS

Global Positioning System. Sistema de localización geográfica vía satélite capaz de dar la localización de una persona u objeto dotado de un transmisor-receptor GPS con una precisión mínima de 10 metros.