Protection System (DPS)
DPS is the brainchild of Quantum Corporation which tests the integrity of
a Quantum hard disk drive that supports this feature. For users of Quantum
Fireball and Fireball Plus drives manufactured after January 1999, the DPS is
available in the drives firmware. For users of older ATA drives, DPS is
available as a standalone program available from Quantum's website.
following has been taken from the Quantum DPS White Paper
How DPS works
DPS performs a Quick Test that exercises the hard
drive. In addition, DPS checks every sector in the drives buffer and examines
the first 300 megabytes of data stored on the drive, where the operating system
and other critical system utilities are typically stored. Within 90 seconds ,
the Quick Test is complete. The results confirm whether the hard drive is the
source of the system failure.
If the DPS Quick
Test results find no errors in the first 300 megabytes of data and the system
continues to malfunction, the end user can run the DPS Extended Test. This test
performs all Quick Test functions, and it also examines all additional data
areas to verify whether the hard drive is the source of the problem. The time
required for the Extended Test depends on the capacity of the drive, but never
exceeds 20 minutes.
Quantum's DPS helps prevent avoidable data loss. By
determining whether the drive is the source of a system level failure, DPS
spares users from unnecessarily removing and replacing a perfectly healthy
drive. Valuable data is protected and productivity maintained. Systems
integrators, distributors, resellers, and OEMs also benefit from reducing their
service costs and -- most importantly -- maintaining the goodwill of their
customers. Quantum's DPS thus provides a comprehensive solution to avoidable data
loss for desktop computer users and their suppliers
another characteristic developed by Quantum which is employed through later
Quantum drives by designing a drive such that certain events of handling the
drive can be endured without incurring any damage.
Damage can be caused to a drive by dropping it, tapping it
with a hand tool and by clicking two drives together. As the level of shock is
absorbed by the drive in these instances, a great deal of internal damage can
occur although there is no evidence of any external damage. This is because
drive internals are extremely sensitive to shock and vibration. Probably one of
the most common types of damage to the hard disk is when a "head slap" occurs.
When sufficient amount of
shock is applied to the drive, the head physically lifts up from the disk and
drops back down which causes the head to actually dig into the surface of the
disk creating surface damage. In addition to the damage on that particular area,
small particles can be scattered. Though these particles are microscopic, the
high precision nature of hard disk mechanics are sensitive and can be affected
by these particles especially if these particles lands on a data area or if it
becomes wedged in between the disk and the head.
Quantum's SPS prevents shock induced
damage to a hard disk by designing a hard disk drive so that the head
is not allowed to lift off the disk, thereby eliminating (or at least significantly
reducing) head-slaps. Rather, the shock would be absorbed by the rest
of the drive rather than having particles run amok after a head slap. The
chances for internal disk damage is thereby reduced through SPS
8.4 GB is sufficient enough for most users out there except for perhaps
folks who require extremely high disk space for graphics and web applications.
But of course the need keeps growing, and fast. I foresee a growing number of
users complaining of space shortage once they install Windows 2000 and its
native applications. Lets face it, software bloats. It takes what once was a
magnetic platter the size of Texas and effectively reduces it down to a cramped
supermarket parking lot.
The speed of CR is slower than its CX
counterpart but in regular applications, you really cannot make out the
difference. And the target consumer of home/office users really won't have much
to complain about. This drive sports numerous features such as SPS and DPS and
runs pretty quiet. As the market is quickly moving towards 7,200 rpm drives, one
cannot say how long the CR 8.4 can remain a competitor. So far, it is doing