XDbit <XD bit>

Field:
Microprocessor > x86/Intel > Intel > XDbit

The memory protect function which the microprocessor of the Intel corporation has. The fact that the program is executed illegitimately is prevented. XDbit is utilized, the software (OS) correspondence on the side being necessary, Windows XP Service Pack of the Microsoft corporation 2 (XP SP2) later and the like is corresponding.

There is “buffer overflow” in the technique which is utilized the occasion where the virus and the cracker take over the computer. Sending the program which has malice in the territory where this was done to overflow, rather than the program having supposed, being accustomed to sending many data, the memory territory, overflowed it is the technique which it makes execute.

By acquiring the sign that in the system which corresponds to XDbit, the cracker and the like sending the program “here is the data area”, in the bit of specification of memory territory, OS inspecting that, it is possible to try not to be able to execute. … The continuation is read

As for XDbit the part product of the Pentium 4 processor of the Intel corporation (those where “J” has been attached to the end of model number) from adoption starts, presently the new product is almost adopted. At the AMD corporation similar function is called the “NX bit”, but technically completely they are same ones.

xD-Picture Card <xD picture card>

Field:
Mobile > memory card > xD-Picture Card

In 2002 Olympus optical industry and the Fuji Photo Film Co., Ltd. jointly it develops and the flash memory card which sells.

Size pulling out SmartMedia, vertical 20× side 25× thickness 1.7mm, as a weight 2g and a similar memory card actualizes worldwide smallest size. As for operating voltage of the xD picture card with 3.3V, 1.3MB/s (capacity the media of 16MB and 32MB), 3.0MB/s (capacity the media above 64MB) with, reads out entry speed and speed is 5.0MB/s. Capacity is things such as 16MB, 32MB, 64MB and 128MB, in the future raising this capacity to 8GB is planned.

The digital camera which corresponds to the xD picture card is sold from both, in the future even from other companies the possibility that the corresponding machine appears. In addition, the USB lead/read lighter/writer in order to read and write the media with the personal computer, the adapter in order to connect to the PC card slot and the CF slot is sold.

xD-PictureCard Type H <xD picture card Type H>

Field:
Mobile > memory card > xD-PictureCard Type H

As for xD-Picture Card Type H high speed of former 2 - 3 times with the model whose reading and writing is possible, as for form and specification etc of terminal it is common with the former xD picture card. The part product and the like of the digital camera of Olympus can correspond to xD-Picture Card Type H, as the usual xD picture card can utilize even with the product of high-speed mode non correspondence.

xD-PictureCard Type M <xD picture card Type M>

Field:
Mobile > memory card > xD-PictureCard Type M

The Fuji film and the bulk model of the flash memory card “xD picture card” which Olympus has propelled. The first product of capacity 1GB was sold in 2005 March.

The name “of Type M” of xD-PictureCard Type M is derived from the densification technology “MLC” of the memory cell, (Multi-Level Cell) actualizes the bulk which exceeds 1GB at the form size which is equal to the former xD picture card. In the future to 8GB the schedule which is expanded. But as for specification and the like of the terminal of xD-PictureCard Type M commonness with the former xD picture card, in the past product when it cannot utilize, the one which you verified whether or not it is, when it utilizes, it corresponds to Type M, is better.

The data rate of xD-PictureCard Type M has become slow until recently somewhat than the item, when high speed reading and writing is necessary, transfer rate past was raised compared to, the xD picture card “of the Type H” model is suitable.

xDSL <DSL>

Field:
Communication service > broadband > xDSL > xDSL

Using the telephone line, high speed general term of the technology which does digital data communication. Because the existing telephone line can be diverted, until the optical fiber spreads, “it connects and” it has spread quickly as a service, but unless central telephone exchange and distance of the user are short, you cannot use, in Japan ISDN and there is also a fault such that there is a possibility the radio interference of doing.