Compaq D310 Floppy Disk Drives, Ultra-ATA/100 Hard Disk Drives, 20GB 40GB 80GB, Ultra ATA

System Features

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.

	20GB	20GB		40GB	80GB
	Ultra ATA 100	Ultra ATA 100		Ultra ATA 100	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)	2		2		2

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.

24 Evo D310 Micro Desktop