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Hitachi Deskstar 7K250 250GB (SATA)
By CPU-zilla
Category : Storage
Published by Jimmy Tang on Tuesday, 2nd December, 2003
Rating : 4.5 out of 5 stars  


Hitachi is probably the last major hard disk manufacturer to join the 80GB/platter arena with the new Deskstar 7K250 series of hard disk drives. In this entirely new line-up, Hitachi has introduced up to 11 new hard disk drives based on their new 80GB/platter technology - with drives for both legacy parallel ATA (PATA) and the newly introduced Serial ATA (SATA) interface. Up to seven drives will be segmented for parallel ATA applications while another four will be introduced for high-end desktops that use the faster SATA interface. Out of the seven PATA drives, you'll find four of them with only 2MB cache (targeting the budget consumers) with capacities ranging from 40GB to 160GB. Another three models for the PATA interface (and SATA) with capacities from 120GB to 250GB will be introduced with a larger 8MB cache - specifically for the performance seekers.

With the new Deskstar 7K250, Hitachi is once again back in the battlefield challenging the other contenders from Western Digital (Caviar SE), Maxtor (DiamondMax Plus 9) and Seagate (Barracuda 7200.7). However, the only real threat is Western Digital as they have already introduced a 250GB model a while back and it would be quite a struggle for Hitachi to really win the consumers over, especially when you consider only the high capacity performance market segment. However, for those who have yet to get one, Hitachi's 7K250 will be a worthy alternative since the Deskstar series have always been known to be an all-round performer.

The Deskstar 7K250 is built with three 80GB/platter disks, each with two read/write heads. Total that up and you get about 240GB. How did the extra 10GB come about? Well, if you look at the specification sheet, you'll notice that the track density of the 250GB model is much higher than those at with 120GB or 160GB capacities. The track density of the 250GB is rated at 93.5 KTPI (thousands of tracks per inch) as compared to the 160GB model which is only 90 KTPI. If you calculate the difference between these two, you'll find that it's about 3.8% more, and that equates to roughly 10GB more.

Similar to most SATA drives from Maxtor, Western Digital and Samsung, the Deskstar 7K250 also utilize a bridge to convert the native parallel signals into serial through a Marvell 88i8030 SERDES bridge. Other than that, the drive is pretty standard as it comes with both the SATA data and power connectors, as well as a legacy 4-pin connector for those who have yet to upgrade their system's power supply.

The Marvell 88i8030 SERDES bridge is used to convert the native parallel data signals into serial.

At the rear end, you'll find the SATA data and power connectors along with a legacy 4-pin power adapter.

Here's the detailed technical specifications :-

Hitachi Deskstar 7K250 (SATA) Technical Specifications
Interface Serial ATA
Capacity 250 GB
Model No. HDS722525VLSA80
Number of Disks 3
Number of Heads 6
Bytes per Sector 512
Average Read Seek 8.5 ms
Track-to-Track Seek 1.1 ms
Full Track Read Seek 15.1 ms
Average Latency 4.17 ms
Rotational Speed 7,200 RPM
Data Transfer Rate 150MB/sec (external); 757Mbits/s (internal)
Buffer 8 MB
Power Requirements 7.6W (idle)
Weight 640 g

The bottom view of the Hitachi Deskstar 7K250.

The Deskstar 7K250 utilizes a Samsung 64Mb 7.5ns SDRAM part for its 8MB buffer.

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