HP EliteBook 2170p Notebook PC - Manual (Page 7)

NOTE: When the SATA controller is in RAID mode, it will only support up to 4 SATA port devices.
Enabling a fifth SATA port device causes the computer to freeze. Removing the fifth SATA port
device restores normal operation.
RAID 0
RAID 0 stripes, or distributes, data across both drives. This allows data, especially large files, to be
read faster because data is read simultaneously from both drives. However, RAID 0 offers no fault
tolerance, which means that if one drive fails, the entire array fails.
RAID 1
RAID 1 copies, or mirrors, identical data on two hard drives. If one hard drive fails, RAID 1 allows
data to be recovered from the other hard drive.
RAID 5
RAID 5 distributes data across three hard drives. If one hard drive fails, RAID 5 allows data to be
recovered from the other two hard drives.
Flexible data protection (Recovery)
Flexible data protection (Recovery) is a feature of Intel® Rapid Storage Technology software.
Recovery enhances RAID 1 functionality with several features that make it easier for users to mirror
data to a designated recovery drive. For example, Recovery allows users to determine how the
recovery volume is updated, either continuously (the default) or on request. Recovery also enables
docking and undocking of the computer if the second drive is in the docking station's bay.
RAID mode summary
The following table describes the functions, applications, and advantages and disadvantages of the
supported RAID modes.
RAID levels Function/Applications Advantages/Disadvantages
RAID 0 Function:
Data is distributed across
both disk drives.
Applications:
● Image editing
● Video production
● Pre-press applications
Advantages:
Read performance is
higher than that of a non-
RAID hard drive.
Total storage capacity is
doubled.
Disadvantages:
The entire array fails if one
drive fails; data cannot be
recovered.
Storage space may be
wasted if the capacities of
the primary and recovery
hard drives are different (see
HP SATA drive option kits
on page 6
).
RAID modes supported 3