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QuickSpecs

HP ProDesk 490 G1 Microtower Business PC

Technical Specifications – Hard Disk and Solid State Storage

c04123126 —14695 — Worldwide — Version 9 —January 21, 2015

Page 25

Introduction:

HP Serial Advanced Technology Attachment (SATA) Hard Drives maximize the performance of HP Business PCs by providing the

technologies to meet your increasing storage demands with high-capacity drives offering superior reliability and performance.

SATA provides faster data transfer speeds, better system cooling airflow, more bandwidth, more headroom for speed increases in

future generations and better data integrity. A next-generation technology, the SATA interface connects hard drives to the PC

platform enabling easy aggregation of multiple hard drives into a single PC. This offers you the additional benefits of dedicated

bandwidth, the ability to more easily identify device failures and scalability. The HP ProDesk 490 G1 Series Business PC supports

the latest SATA 6.0Gb/s specification.

SMART IV Technology

Self Monitoring Analysis and Reporting Technology (SMART) hard drive technology allows hard drives to monitor their own health

and to raise flags if imminent failures are predicted. If the drive determines that a failure is imminent, the SMART hard drive

technology enables the intelligent manageability or management software to generate a fault alert. While the current versions of

SMART hard drives do a good job monitoring the data on the hard drive media, the ever increasing emphasis on reliability and

quality has promoted HP to implement SMART IV technology which constantly checks that the data flow from host interface to

media and media to host interface is not compromised. This is accomplished by inserting a 2 byte parity code into every 512 byte

block in the data path of the hard drive's Cache RAM. This unique parity checking performed by HP's SMART IV technology hard

drives, allows for more complete error detection coverage encompassing the entire data path between the host and the hard drive.

Smart IV is also known as IOEDC: I/O Error Detection Code.

Native Command Queuing

NCQ or Native Command Queuing is a SATA protocol extension that allows the hard drive to have several write or read commands

outstanding at the same time. In contrast, normal non-queued operation requires each command to be completed before the next

command is issued by the host system. Queuing allows the drive to complete the commands in the order that allows for best

overall throughput. It also involves an advanced method of transferring data to or from the host, called First Party Direct Memory

Access (FPDMA), which allows the hard drive and the host controller to manage the data transfers for multiple outstanding

commands, without involving the host processor. NCQ can contribute to better performance but the results are dependent on

many factors, including the access patterns of the various applications and operating system functions that are initiating drive

accesses. Enabling NCQ features in the hard drive requires AHCI support from the host system BIOS, controller, and driver. AHCI

support is typically implemented in RAID configurations.

Note: GB = 1 billion bytes. Actual available capacity is less.

Redundant Array of Independent Drives (RAID)

Flexible implementation:

 Hard drive information can be viewed within F10 Setup while in RAID mode. Previously, the hard drives will not appear in

Drive Configuration when switching to RAID mode.

 DPS Self Test can be executed on physical hard drives while in RAID mode.

NOTE:

RAID 1 is the only RAID configuration offered via factory configurations. The pre-configured systems:

 Are complete RAID systems and have both drives installed. If the MT is configured with three hard disk drives, the third

drive is would be un-partitioned and not part of the RAID array

 Have the necessary Option ROM configuration.

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