MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

G-38 Glossary
RS-232 standard An industry standard for serial communication connections.
Adopted by the Electrical Industries Association (EIA), this recommended standard
defines the specific lines and signal characteristics used by serial communications
controllers to standardize the transmission of serial data between devices.
S
safe mode A method of starting Windows XP Professional using basic files and drivers
only, without networking. Safe mode is available by pressing the F8 key when
prompted during startup. Safe mode allows the computer to start when a problem
prevents it from starting normally.
SAP (service access point) See service access point (SAP).
SAP (Service Advertising Protocol) See Service Advertising Protocol (SAP).
Scheduled Tasks A feature of Windows XP Professional that lets you schedule programs,
scripts, batch files, or documents to run once, at regular intervals, or at specific
times.
schema Contains a formal definition of the contents and structure of Active Directory,
including all attributes, classes, and class properties. For each object class,
the schema defines what attributes an instance of the class must have, what additional
attributes it can have, and what object class can be a parent of the current
object class.
Screen Resolution A setting that allows you to set the number of pixels Windows
uses to display the Desktop.
SCSI See Small Computer System Interface (SCSI).
SDLC See Synchronous Data Link Control (SDLC).
Secondary Logon Service A service in Windows XP Professional that allows a user
to run a program (using the Run As command) with different credentials from the
currently logged-on user.
sector A portion of the data-storage area on a disk. A disk is divided into sides (top
and bottom), tracks (rings on each surface), and sectors (sections of each ring).
Sectors are the smallest physical storage units on a disk and are of fixed size—typically
capable of holding 512 bytes of information each.
sector sparing A fault-tolerant system also called hot fixing. It automatically adds
sector-recovery capabilities to the file system during operation. If bad sectors are
found during disk I/O, the fault-tolerant driver will attempt to move the data to a
good sector and map out the bad sector. If the mapping is successful, the file system
is not alerted. It is possible for SCSI devices to perform sector sparing, but AT
devices (ESDI and IDE) cannot.