Dell Studio 15 (1555, Early 2009) - Manual (Page 47)

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Using Your Studio Laptop
Entertainment and Multimedia
You can use your computer to watch videos,
play games, create your own CDs/DVDs, listen
to music and radio stations. Your optical drive
may support multiple disc media formats
including CDs, DVDs, and Blu‑ray Discs
(optional).
You can download or copy pictures and video files
from portable devices, such as digital cameras
and cell phones. Optional software applications
enable you to organize and create music and
video files that can be recorded to disc, saved
on portable products such as MP3 players and
handheld entertainment devices, or played and
viewed directly on connected TVs, projectors,
and home theater equipment.
Free Fall Sensor
Free fall sensor protects your computer hard
drive from possible damage, by detecting a free
fall state caused by accidentally dropping the
computer. When a free fall state is detected, the
hard drive is placed in a safe state to protect
against damage to the read/write head and
possible data loss. Your hard drive returns to
normal operation, when the free fall state is no
longer detected.