Here are some more information for Rom Fdd:

Flexible Circuit Boards have varied uses and features

Flexible printed circuits are widely used today because of low cost, ease of assembly in interconnection systems, and the low volumes that they occupy. Board-to-board, board-to-chip, and chip-to-chip connections are areas where they are most used. They are also essential in packages with limited space and stacked rigid boards, thus demanding three-dimensional connections. The largest of use of flexible circuits can be seen in portable electronic products. These include notebook (NB), mobile phone, personal digital assistant (PDA) and information appliance (IA). The flexible printed circuit board, for example, can work as an interface between a liquid crystal display (LCD), a floppy disk driver (FDD), a hard disk driver (HDD) or a compact disc read only memory driver (CD-ROM) to a motherboard. Such is the wide usefulness of Flexible circuit boards.

Flexible circuits with optical and electrical components have become essential since optoelectronics has spread into more and more applications. Prefabricated optical fibers are used to assemble flexible circuits in such situations. Wherever fiber management is needed flexible circuit boards are used. Flexible optical circuits, for example, greatly used as as optical backplanes in order to interconnect a number of printed circuit boards. These can also serve as ribbons of optical fibers in order to route the optical fibers in an designated

There are four types of flexible printed circuit board. This division is based on functions. They are: lead line, printed circuit, connector, and integration function system. The flexible circuit connector includes an insulative housing mounted to the rigid circuit board. In all, it is obvious that with such varied features and uses flexible boards have emerged as a top choice as far as the electronic industry is concerned today.

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For more information on printed circuit board manufacturing log on to http://www.a-flex.com/Flexible.html

What makes this computer better than the others?

The most expensive one-
Processor: Intel Pentium™ 4 3.0 GHz HT (with HyperThreading Technology)
Memory: 1 GB DDR RAM
HDD/FDD/CDROM: 250 GB, 1.44 FDD, DVD-Rom

Price difference is mainly due to processor difference. Pentium 4 3.0Ghz (HT) is faster. HT gives the processor the capability to operate as if you have 2 processors. BUT HT also makes the processor run HOT. Most users just turn off HT to reduce heat.

Dual cores made HT obsolete. The processors you listed above are obsolete. They are now relatively slow and consume more power. Better consider newer processors. There are cheap variants.

The new Core 2 Duo easily beats the old Pentium 4. Here are some comparisons on budget Core 2 Duo with the older Pentium 4 (dual cores also):
http://www.xbitlabs.com/articles/cpu/display/pentium-e2160_9.html#sect0
http://www.xbitlabs.com/articles/cpu/display/pentium-e2160_13.html#sect0
The new Pentium E2140 and 2160 are cheap but uses Core2 Duo high performance technology.

PICMG board offers six RAID-ready SATA ports
Axiomtek announced a PICMG 1.3 single board computer (SBC) that supports Intel Xeon, Core i5/i3, and Pentium processors. The SHB105 offers up to 8GB of unbuffered ECC DDR3 memory, PCI Express and PCI expansion, six RAID-enabled SATA connectors, dual gigabit Ethernet ports, and 12 USB 2.0 ports.

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