Articles: Storage

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It’s time for the manufacturers of hard disk drives of the 2.5” form-factor to make room for one more player. Well, this new player is in fact an old and experienced HDD maker. I guess you know it – it’s Seagate. On June 16, 2003, the corporate website posted a press release with an announcement of a new hard disk drive series called Momentus.

This news would hardly seem extraordinary if it were not for a single nuance – Seagate is returning to small drives production. You may have already forgotten about it, but the company did show up in this market sector – with the Marathon family for notebooks. The last 4GB representative of this series saw the light of the day as far back as the end of 1997. The reason the company abandoned 2.5” drives was simple – this area was far from commercially beneficial. The notebook market was smaller then than nowadays; demand didn’t match supply. But the last few years have brought about great changes.

Mobile computers are evolving fast; there are ever more companies that produce ever more notebooks. It’s quite natural the notebook HDD market is growing at a higher rate than the market of ordinary HDDs intended for desktops and workstations. The demand for 2.5” drives is forecast to be about 50 million in 2004. So, Seagate is quite right in coming back: it has a real chance to be successful and profitable. Moreover, 2.5” drives can probably replace their 3.5” analogs in desktop PCs in the future; at least they have the strength to do it.

Well, managers from Seagate have corrected their course and now offer us new 2.5 form-factor hard disk drives of the Momentus family.

Momentus Series Drives

This is a kind of advertisement poster for the new product – the comparison to the hummingbird emphasizes the fast speed and light weight of the drive.

Specifications of Seagate ST94811A:


 Ultra ATA/100

Maximum internal transfer rate


Maximum external transfer rate


Sustained transfer rate


Cache size


Average seek


Average latency


Spindle speed






Power (Seek)


Power (Read/Write)


Power (Idle/Standby)


Shock, operating, 2ms


Shock, non-operating, 2ms


Noice (Idle)

 2.2 bels

Noice (Quit Seek)

 2.5 bels

Noice (Performance Seek)

 3.0 bels





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