Specs:
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Hard drive Name: Ultrastar 18ES
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Model number: DNES-318350
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Part number: 25L1950
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Capacity: 18.2 GB
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Interface: SCSI
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Interface variant: 80 PIN SCA
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Form factor: 3.5INCH
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Rotational Speed - 7200 RPM
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Average seek time - 7.0ms
Overview from Manfacturer's DataSheet:
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Capacities of 18.2 GB and 9.1 GB and an areal density of 3.03 Gbits/square inch provide superior data storage for a one-inch high low-profile drive.
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Average seek times as fast as 7.0 ms and sustained data rates of up to 20.2 MB/sec enable rapid data transfer.
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The first implementation of giant magnetoresistive (GMR) head technology in server-class drives provides an unprecedented areal density of 3.67 GB per disk.
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An efficient electronic design and a new integrated LSI chip enable the industry?s lowest power dissipation at 7200 RPM?improving reliability and easing integration. Low-idle acoustics provide excellent environmental qualities.
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Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.) and the exclusive IBM Drive Temperature Indicator Processor (Drive-TIP*) feature enhance data protection.
The Ultrastar 18ES is designed to provide a reliable, cost-effective storage solution for a wide range of workstations, high-performance desktop systems, and LAN and enterprise servers running Internet, intranet, CAD/CAM, multimedia, transaction processing, and data mining applications.
The Ultrastar 18ES achieves its high level of reliability, performance, and affordability by leveraging the experience of IBM in the development and implementation of advanced disk drive technologies. These include giant magnetoresistive (GMR) head technology, No-ID* sector formatting, the Partial Response Maximum Likelihood (PRML) digital data channel, and a new integrated LSI chip.
GMR head technology dramatically increases areal density and reduces the number of disks and heads required for a given capacity. No-ID sector formatting increases storage capacity by eliminating overhead caused by the duplicate storage of each data sector?s ID field onto the disk, which thereby creates more available disk space for data. PRML enables higher areal densities and significantly enhances the drive?s Ultrastar 18ES 3.5-inch 18.2 GB lowprofile SCSI hard disk drive.
IBM has developed an integrated LSI chip that incorporates a microcomputer, hard disk controller, and flash memory in a single chip. This design helps to increase performance, reduce power usage, and enhance reliability.
Ultrastar 18ES drives support Ultra2 SCSI and Fibre Channel-Arbitrated Loop (FCAL) interfaces. | 
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