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24 Evo D310 Micro Desktop
Hard Disk Drives
A 3.5-inch hard disk drive is supplied on an internal shelf in some models. These hard drives can be
provided with the PC. To see which other hard disk drives can be purchased as accessories for the
Compaq Evo D310 Micro Desktop , refer to
www.hp.com/go/pcaccessories
.
Ultra-ATA/100 Hard Disk Drives
ATA (AT Attachment) is a disk drive implementation designed to integrate the controller into the drive
itself, thereby reducing interface costs, ATA is also known as IDE (Integrated Drive Electronics).
Ultra ATA/100 is the latest generation of the ATA interface, it increases burst data rates significantly over
previous versions of the protocol. Also known as Ultra DMA/100 and Feature ATA, Ultra ATA/100 allows
host computers to send and receive data at 100MB/s. The result is maximum disk performance under
PCI local bus environments.
At its fast burst data rates, Ultra ATA/100 removes bottlenecks associated with data transfers, especially
during sequential operations. Ultra ATA/100 also delivers heightened data integrity to the EIDE interface
through use of a 40-pin 80-conductor cable, and CRC (Cyclic Redundancy Check) error detection code.
The 80-conductor cable reduces crosstalk and improves signal integrity by providing 40 additional
ground lines between the 40-pin IDE signal and ground lines. The connector is plug-compatible with
existing 40-pin headers, and the incremental cost for the cable should be minimal.
By increasing the burst transfer rates of IDE drives, Ultra ATA/100 brings the effective transfer rate of
the system's bus and a drive's internal data rate that much closer into balance. Ultra ATA/100 allows
greater system throughput, particularly for long sequential transfers required by audio/visual
applications.
Ultra ATA/100 hard drives are 100 percent backwards compatible with Ultra ATA/66, Ultra ATA/33, and
DMA, as well as with existing EIDE/IDE hard drives, CD-ROM drives, and host systems.
NOTE S.M.A.R.T. or Self Monitoring Analysis and Reporting Technology allows the hard disk drive to report certain types of degradation or
impending failure. This allows the operating system to take the necessary precautions and warn the user. The system is comprised of
software that resides both on the disk drive and on the host computer. The disk drive software monitors the internal performance of
the motors, media, heads, and electronics of the drive, while the host software monitors the overall reliability status of the drive. The
reliability status is determined through the analysis of the drive's internal performance level and the comparison of internal
performance levels to predetermined threshold limits.
Floppy Disk Drives
All models are supplied with a 3.5-inch floppy disk drive.
20GB
Ultra ATA 100
20GB
Ultra ATA 100
40GB
Ultra ATA 100
80GB
Ultra ATA 100
Average Seek Time (ms)
8.9 to 12.1 8.5 to 8.9 9.5
Track-to-Track Seek TIme (ms)
1.5 1.2 0.95
Full Stroke Seek Time (ms)
20 to 25 15 -
Rotational Speed (RPM)
5400 7200 7200
Buffer Size (MB)
222