Rpm Scsi
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 Maxtor 36GB SCSI 10000RPM HDD 8B036L0 Refurbished  US $99.99
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 Hitachi 36GB SCSI 10000RPM HDD 08K0342 Refurbished US $99.99
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Engineering Effort of Hp on Dat160
The majority of the engineering effort on the DAT-160 drive has gone into the
DAT 160 cartridge load/unload, DAT160 media threading and tape path. The
base error rate ERT of the drive measures how good the tape path and threading
is. Minor deviations in tape tracking and tape edge damage manifest themselves
in a degradation of ERT.
A key design brief of the DAT160 tape drive is that it is a transition step to higher capacity DAT technology and HP wanted to ensure that the installed base had a good backwards compatibility experience. Ensuring existing users of DAT72 and DAT40 media see a good return on their investment in the technology is seen as being crucial to the ongoing success of DAT. HP sees backwards compatibility as being a fundamental element of the DAT160’s return on investment equation, unlike other technologies that offer increased capacity/performance but offer no backwards compatibility.
A significant element of any development program is testing. Design Verification and Test (DVT) reports are developed testing each specification. Because of the complexities of the two formats, the test plan for the DAT160 drive was much larger and longer than for previous generations of DAT. In total 450,000 hours (more than 5 years) of testing were performed on the DAT160 drive before release.
HP provides an MTBF Mean time between failures and bit ERT specification for its DDS products as a guide to the reliability that can be expected during customer use of these products. These specifications have, in the past, been generated using pre-production testing during the development of products.
The existing specifications for the DDS products (pre 2004) were:
MTBF: 400,000 hours at a 12% duty cycle
Unrecoverable bit ERT: 1 in 1x10-15
Based on field data gathered for the HP DDS-4 and DAT72 products, these specifications have now been revised to bring them inline with the reliability seen in the field by end users based on an assumed duty cycle. Therefore, this gives a much more representative measure of the real reliability of the product.
The revised specifications are:
MTBF: 125,000 hours at a 100% duty cycle
Unrecoverable bit ERT: 1 in 1x10-17
Parallel SCSI Ultra 320 is being superseded by SAS interfaces on systems and servers. This trend is being followed by the tape drive industry. In almost all ProLiant servers, parallel SCSI is being phased out and Serial Attach SCSI (SAS) is taking its place. HP is providing the DAT160 drive in three variants to assist users in the change over. We see SCSI variants being used in traditional legacy situations.
SAS DAT160 tape drives can connect either to an embedded SAS RAID controller or to a dedicated SAS HBA. All desktops, laptops, and servers now have more than one USB port. So with these three connectivity options, SCSI (for installed base), SAS for future server connect, and USB (for universal connect), the DAT160 drive is assured to protect customer’s investment in DAT technology.
HP has thought of everything with the DAT 160 drive. When HP launched the latest versions of the DAT72 drive, especially the DAT-72 USB, some customers considered the fan too loud for typical office environments. HP has re-engineered the solution and the DAT160 drive will benefit from this.
The original fan in the DAT 72 enclosure ran at 8200 rpm and generated noise of 28.0 dBA. The new fan in the DAT-160 enclosure is larger than in the previous DAT-72 enclosures and hence gives more airflow at a lower noise level. The fan runs at 3700 rpm and generates noise of 22 dBA, which is now much more “office friendly.”
Some other engineering adjustments also enabled the slower fan to provide the effective cooling required by the DAT160 drive:
- Improved air exhaust efficiency by increasing the size of the vent holes at the rear of the enclosure
- Minimized impeller cavitations by ”dishing” the fan vent, so creating a space between the rear panel and the fan
Improved stability of air flowing into the fan by increasing the length of the enclosure (so more space behind drive)
About the Author
Shawn Paul (Marketing Manager)
34972 Newark Blvd, # 501, Newark CA 94560
Tel : 888-491-4949
Fax : 888-449-5050
Email: sales@tape4backup.com
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18.2GB SCSI Compaq Wide Ultra 3 SCSI 10K RPM 142673-B21 $19.45 18.2GB SCSI Compaq Wide Ultra 3 SCSI 10K RPM 142673-B21 |
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18.2GB SCSI IBM Ultra160 15K RPM 06P5717 $77.72 18.2GB SCSI IBM Ultra160 15K RPM 06P5717 |
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36.4GB Compaq U320 SCSI 10K RPM 289041-001 $20.93 36.4GB Compaq U320 SCSI 10K RPM 289041-001 |
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72.8GB SCSI Compaq ULTRA3 10K RPM 233349001 $24.35 72.8GB SCSI Compaq ULTRA3 10K RPM 233349001 |
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HP Ultra3 SCSI - 10000 rpm 163587001 $29.05 HP Ultra3 SCSI - 10000 rpm 163587001 |
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36.4GB Scsi Compaq U320 10K RPM 271837-003 $135.5 36.4GB Scsi Compaq U320 10K RPM 271837-003 |
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Axiom 300 GB - 10000 rpm - Serial Attached SCSI - Internal AXDPE30010G $396.27 Axiom 300 GB - 10000 rpm - Serial Attached SCSI - Internal AXDPE30010G |
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147GB SCSI Fujitsu HP 10K RPM U320 80pin Oem MAW3147NC $41.03 147GB SCSI Fujitsu HP 10K RPM U320 80pin Oem MAW3147NC |
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36GB SCSI Seagate 10K RPM U320 68pin ST336807LW $189.45 36GB SCSI Seagate 10K RPM U320 68pin ST336807LW |
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Cisco 10000 rpm - SAS 600 - Serial Attached SCSI A03D146GA2 $293.07 Cisco 10000 rpm - SAS 600 - Serial Attached SCSI A03D146GA2 |
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146GB SCSI SUN Ultra320 10K RPM 80pin 3.5" ST314670LSUN146G $242.81 146GB SCSI SUN Ultra320 10K RPM 80pin 3.5" ST314670LSUN146G |
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IBM Ultra320 SCSI - 15000 rpm - 3.5" - Hot Swappable 90P1309 $277.6 IBM Ultra320 SCSI - 15000 rpm - 3.5" - Hot Swappable 90P1309 |
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IBM Ultra160 SCSI - 10000 rpm - 3.5" 06P5760 $210 IBM Ultra160 SCSI - 10000 rpm - 3.5" 06P5760 |
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IBM Ultra320 SCSI - 10000 rpm - 3.5" - Hot Swappable 32P0731 $398.3 IBM Ultra320 SCSI - 10000 rpm - 3.5" - Hot Swappable 32P0731 |
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IBM 73.4 15K RPM ULTRA320 SCSI HS HDD/NEW BULK $276.95 IBM 73.4 15K RPM ULTRA320 SCSI HS HDD/NEW BULK |
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IBM 36.4 15K RPM ULTRA320 SCSI HS HDD/NEW BULK $136.55 IBM 36.4 15K RPM ULTRA320 SCSI HS HDD/NEW BULK |
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73GB IBM SCSI Ultra320 10K RPM 80pin XSeries 32P0730 $32.36 73GB IBM SCSI Ultra320 10K RPM 80pin XSeries 32P0730 |
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36.4GB SCSI IBM Hot-Swap 10K RPM 2.5in 26K5654 $23.08 36.4GB SCSI IBM Hot-Swap 10K RPM 2.5in 26K5654 |
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73.4GB SCSI IBM 10K RPM U320 Non Hot-Swap 90P1313 $13.8 73.4GB SCSI IBM 10K RPM U320 Non Hot-Swap 90P1313 |
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73.4GB IBM SCSI X Series 10K RPM w/TRAY 06P5318 $96.63 73.4GB IBM SCSI X Series 10K RPM w/TRAY 06P5318 |
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IBM 18.2GB 10K RPM U160 SCSI HDD/NEW Bulk $66.35 IBM 18.2GB 10K RPM U160 SCSI HDD/NEW Bulk |
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IBM 36.4GB 10K RPM U160 SCSI HS HDD $89.75 IBM 36.4GB 10K RPM U160 SCSI HS HDD |
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9.1GB SCSI Compaq Hard Drive Pluggable 15K RPM 188120B22 $37.75 9.1GB SCSI Compaq Hard Drive Pluggable 15K RPM 188120B22 |
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146GB SCSI Compaq 10K RPM U320 Pluggable 289044-001 $228.25 146GB SCSI Compaq 10K RPM U320 Pluggable 289044-001 |
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73GB Scsi HP 10K RPM ULTRA3 DRIVE/BULK $373.75 73GB Scsi HP 10K RPM ULTRA3 DRIVE/BULK |
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72.8GB SCSI HP 15K Ultra320 Hot-Plug HDD RPM 286778-B22 $23.21 72.8GB SCSI HP 15K Ultra320 Hot-Plug HDD RPM 286778-B22 |
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146GB SCSI HP Compaq 10K RPM U320 Pluggable 289044-001 $38.03 146GB SCSI HP Compaq 10K RPM U320 Pluggable 289044-001 |
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36.4GB SCSI Compaq U160 Hplug 15K RPM HDD 251872-002 $55 36.4GB SCSI Compaq U160 Hplug 15K RPM HDD 251872-002 |
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HP Ultra320 SCSI - 10000 rpm - 3.5" 286714B22 $177.25 HP Ultra320 SCSI - 10000 rpm - 3.5" 286714B22 |
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HP Ultra3 SCSI - 15000 rpm - 3.5" - Hot Pluggable 189393001 $40.45 HP Ultra3 SCSI - 15000 rpm - 3.5" - Hot Pluggable 189393001 |
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HP Ultra3 SCSI - 7200 rpm - 3.5" - Hot Swappable 199882001 $23.35 HP Ultra3 SCSI - 7200 rpm - 3.5" - Hot Swappable 199882001 |
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72.8GB SCSI Compaq U320 Pluggable 10K RPM 289042-001 $23.21 72.8GB SCSI Compaq U320 Pluggable 10K RPM 289042-001 |
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146.8GB SCSI HP Compaq 15K RPM Ultra320 Hot Swap 404712001 $81.35 146.8GB SCSI HP Compaq 15K RPM Ultra320 Hot Swap 404712001 |
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36.4GB Scsi Compaq Hard Drive U320 10K RPM 3RA3838AA $135.5 36.4GB Scsi Compaq Hard Drive U320 10K RPM 3RA3838AA |
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36.4GB Scsi Compaq Hard Drive U320 15K RPM 3RA3849AA $106.75 36.4GB Scsi Compaq Hard Drive U320 15K RPM 3RA3849AA |
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36.4GB SCSI HP Compaq U320 10K RPM Hot-Swap 289041-001 $135.5 36.4GB SCSI HP Compaq U320 10K RPM Hot-Swap 289041-001 |
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