Why is Drive Translation necessary?

image DOS and DOS based programs like Windows 3.x and Windows 95 cannot access drives over 1024 cylinders on their own, but require third party assistance to use large hard drives. SCSI drives handle this with drivers built in to the SCSI controller, so we will limit this discussion to ATA hard drives. There are several methods used to overcome the cylinder limitation, and all of them involve translation.

A translation scheme converts information from one form to another and back again. Think of it like this: If you go to a foreign country to conduct business and you don’t speak the language, you need a translator. The translator’s job is to convert information from one party into a language the other party can understand and vice versa. Without the services of a translator, the two parties have a limited exchange of information. A smile, a nod, and a mispronounced and grammatically incorrect “How are you?” is about all that is possible.

The types of translation support are as follows:

1. An ATA (IDE) host adapter with a BIOS that provides large drive support.

2. Third party software like EZ-DriveĀ® and DiscWizard Starter Edition.

3. A motherboard BIOS that provides large drive support. Some of the terminology is as follows:

  • Logical Block Addressing (LBA)
  • Large
  • Extended Cylinder, Head, Sector (E-CHS)
  • Sector Translation
  • Sector or Track Mapping

These support features are the “language” translators that allow your operating system and hardware to speak two different “languages” and still interact successfully with one another.

All of the BIOS options, once installed, are transparent to the user. EZ-Drive and DiscWizard Starter Edition are not. In addition, there is one issue that both share — special procedures are needed to boot to a diskette when installing new software.

Dynamic Drive Overlay software like EZ-Drive and DiscWizard Starter Edition use similar techniques, at first glance, to overcome the 1024 cylinder limitation. Both programs load proprietary translation information on the boot hard drive that identifies which drive is using the program and gives the operating system access to the area of the drive over 1024 cylinders. Without this proprietary translation code loaded, the drive using EZ-Drive or DiscWizard Starter Edition is unrecognizable to the operating system. If the hard drive is using translating software, and you try to boot with an unmodified diskette in the floppy drive, the translating software does not get a chance to load, thereby rendering the hard drive unreadable. This is generally only a problem if the diskette is infected with a virus. Simply remove the diskette and reboot. The hard drive should boot normally.

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The Information about Linux Desktop from IBM

linux21 May 2009: IBM announced the results of a study conducted by the I.T. analyst firm Freeform Dynamics, commissioned by IBM, which showed that Linux desktops were easier to implement than IT staff expected if they targeted the right groups of users, such as those who have moderate and predictable use of e-mail and office tools

The research behind the report, “Linux on the Desktop: Lessons from Mainstream Business Adoption,” was designed, executed and interpreted independently by Freeform Dynamics. Feedback was gathered via an online survey of 1,275 I.T. professionals from the U.K., U.S., Canada, Australia, New Zealand and a spread of other countries across Western Europe and the Nordics. Ninety percent of the study’s respondents had direct experience with desktop Linux deployment in their business.

Those with experience of such migrations said that Linux on the desktop was best achieved when it was first targeted to groups of non-technical users. Transaction workers and general professional workers were seen as more than twice as likely to be primary targets for desktop Linux adoption than mobile and creative staff. A majority of the respondents indicated that Linux desktop deployments to these targeted groups was easier than anticipated.

“Some users care a great deal about their desktop computing environment and may be emotionally or practically wedded to Windows,” said Dale Vile, research director, Freeform Dynamics. “The trick is to avoid getting distracted by these, and focus on the users for whom the PC on their desk is simply a tool to get their job done. Migrating a general professional user who only needs to access a couple of central systems, an email inbox and light word processing is pretty straightforward.”

Key statistics of the study include:

71% of respondents indicated cost reduction as their primary driver for adoption.
35% stated the ease of securing the desktop was another primary driver
32% cited the lowering of overheads associated with maintenance and support in general were factors contributing to the benefit of desktop Linux adoption
Those with experience of Linux desktop rollouts are 50% more likely to regard non-technical users such as general professional users and transaction workers as primary targets for Linux
58% of those with prior experience of a Linux desktop rollout see general professional users as primary targets
52% of those with prior experience of a Linux desktop rollout see transaction workers as primary targets.
32% of those with prior experience of a Linux desktop rollout see power users as primary targets.
47% of respondents said usability was the main consideration when evaluating or selecting a desktop Linux distribution for use in a business environment

The study confirmed Linux on the desktop adoption is primarily driven by cost reduction. About twice as many of the respondents cited cost savings over security as the primary driver of why they’d adopt Linux on the desktop. Participants in the study indicated that both environments can be secured adequately — it’s just cheaper to secure a Linux desktop and maintain it that way.

“If a company is a ‘Windows shop,’ at some point it will need to evaluate the significant costs of migrating its base to Microsoft’s next desktop and continuing the defense against virus and other attacks,” said Bob Sutor, vice president of Linux and open source, IBM Software Group. “Savvy IT departments see the Linux desktop as a PC investment that actually saves money during this downturn. We see the recession fueling open source on the desktop.”

The user groups in the study were defined as:

IT operations/support staff
General professional users (relatively light and predictable use of e-mail, office tools, etc)
Transaction workers (mostly using enterprise applications in a routine prescriptive manner)
Other (non-IT) technical staff (e.g. engineers, technical designers/architects)
Office based power users (e.g. finance staff, marketing teams, knowledge workers, etc)
Highly mobile professional users (e.g. sales, roaming managers, etc)
Creative staff (non-engineering, e.g. graphic design)

For more information on IBM, you can visit http://www.ibm.com/think

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USB 2.0, USB 3.0, or FireWire – What is the recommended solution for data storage?

1. What is USB 2.0?

USB 2.0, USB 3.0, Firewire USB 2.0 is the industry standard peripheral connection type for most x86 computers (Windows based). This specification is rated with maximum transfer rate of 480Mb/s (60MB/s). Sustained transfer rate of USB 2.0 depends on many factors including type of device in use, data being transferred, and speed of the computer system. A normal sustained data transfer rate for USB 2.0 ranges from 10-30 MB/s. Only burst data transfers can reach the 480Mb/s rate.

What are the benefits of USB 2.0?

  • USB 2.0 is “hot swappable,” eliminating the need to reboot or restart your computer when attaching a device.
  • There’s no need for terminators, memory addresses or ID numbers with USB devices.
  • Various sorts of devices can plug into a USB port: external hard drives, digital cameras, printers, Zip drives, SuperDisk drives, floppy drives, mice, keyboards, etc.

2. What is USB 3.0?

USB 3.0 is the replacement connection type for USB 2.0. This specification is rated with maximum transfer rate of 4Gb/s. Sustained transfer rate of USB 3.0 depends on many factors including type of device in use, data being transferred, and speed of the computer system. Sustained transfer rates can reach speeds of 3.2 Gbit/s.

What are the benefits of USB 3.0?

  • USB 3.0 is “hot swappable,” eliminating the need to reboot or restart your computer when attaching a device.
  • There’s no need for terminators, memory addresses or ID numbers with USB devices.
  • Various sorts of devices can plug into a USB port: external hard drives, digital cameras, printers, Zip drives, SuperDisk drives, floppy drives, mice, keyboards, etc.
  • USB 3.0 is backwards compatible with USB 2.0 ports, and USB 2.0 devices will work on a USB 3.0 port (both at USB 2.0 speeds)

3. What is FireWire?

FireWire is a high-performance connection standard for personal computers and consumer electronics. Originally developed for Apple computers, this connection has been implemented by x86 computers for some time now. FireWire can move large amounts of data between computers and peripheral devices at transfer rates of up to 400 Mb/s (50 MB/s). A new FireWire specification, FireWire 800 (or FireWire B) has entered the computer market with transfer rates of up to 800 Mb/s (100MB/s).

What are the benefits of FireWire?

  • FireWire is “hot swappable,” eliminating the need to reboot or restart your computer when attaching a device.
  • There is no need for terminators, memory addresses of ID numbers with FireWire devices.
  • Though USB 2.0 is rated at a higher throughput speed (480Mb/s related to FireWire’s 400Mb/s), FireWire delivers faster performance for sustained transfer rates on external hard drives. This is because FireWire has lower overhead (less instructions that the CPU has to interpret related to USB 2.0).

Which connection type is better? USB 2.0, USB 3.0 or FireWire?

  • If you plan on transferring large amounts of data often, then USB 3.0 would be the best connection type for you.
  • If you are doing Audio/Video or are on a Mac, than FireWire would be a good choice as many of these programs recommend FireWire over USB 2.0, and Apple currently does not support USB 3.0.
  • If you want the versatility of connecting the hard drive to many different computer systems quickly and easily, and transfer rates are not that important, then USB 2.0 would be the ideal because it is compatible with both PCs and Macs, and most computers today still have USB 2.0 ports.
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