HP ProDesk 490 G2 Quickspecs page 28

QuickSpecs
Technical Specifications – Hard Disk and Solid State Storage
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 G2 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.
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 G2 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
Worldwide — Version 1.8— May 22, 2014
HP ProDesk 490 G2 Microtower Business PC
Page 28