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Frequently Asked Questions

How do I go from SCSI to IDE?

Lone Star Software - LONE-TAR FAQ's
During the creation of A1, after 'gathering additional device files', I get the following error message: Using AIR-BAG diskettes to restore my system or restore to another system, the following error occurs after hitting return at the Boot: on the first diskette. When I create my AIR-BAG diskettes, the creation hangs when creating the A2 in the middle putting the files on the diskette.
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Can SpinRite low-level format my IDE, EIDE, or SCSI drive?

GRC | SpinRite 6.0 FAQ - Frequently Asked Questions
No software of any sort can truly low-level format today's modern drives. The ability to low-level format hard drives was lost back in the early 1990's when disc surfaces began incorporating factory written "embedded servo data". If you have a very old drive that can truly be low-level reformatted, SpinRite v5.0 will do that for you (which all v6.0 owners are welcome to download and run anytime).
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What is the difference between SCSI and IDE?

Web Hosting FAQ
The primary difference is that SCSI (Small Computer System Interface) has a processor built into the drive which allows for faster read / writes. IDE drives rely on the CPU. SCSI may be beneficial to you if you are planning to run a database or other resource intensive application. An IDE drive is suitable for standard web serving. RAID Level 5 provides you with the redundancy necessary to recover from a single hard drive failure.
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PLEASE DO NOT ASK "Which is better IDE or SCSI"?

SCSI FAQ
Please spare us all the aggravation of the week long tirade that will result from asking this seemingly innocent question!
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Do I need SCSI or IDE drives on VMware?

Honeywall CDROM FAQ
Currently Honeywall works on IDE drives only. You can configure IDE drive from Advanced Virtual Disk options in VMware. Future version of Honeywall CDROm should support SCSI. Normally, you get an allocation resource error when VMware is not able to properly communicate with the host devices. The error can be ignored, as it doesn't stop Honeywall from booting.
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QUESTION: Can I have both IDE/ATA drives and SCSI in the same system?

SCSI FAQ
The main issue is which device will be used for booting the system. Under MSDOS, The system BIOS determined this completely. A couple third party BIOSes (like MRBIOS) allowed the user to choose the boot source, but most conventional BIOSes just booted from the IDE if it was present. If no IDE was present then the standard option card BIOS scan would find the SCSI card's BIOS and use it to boot. Under Windows 95 and Windows NT, there are more options.
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Can I use a combination of drive interfaces such as IDE to SCSI?

SystemGuardian XC/2000 Technical FAQ - DuoCor Technical Supp...
Yes, if the source disk is bootable on multiple machines, then it's DPSR drive is bootable on the same machines. Windows usually locks it's installation to the system it was originally installed on, so moving an installation to a different machine usually results in Windows not booting correctly. We believe this to be an excellent way to quickly and easily carry your "work" back and forth from the office to the home.
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What types and sizes of SCSI and IDE hard disk drives are supported?

NetZerver - NAS Storage Solutions
All sizes of EIDE compatible drives are supported, however only the first 137gb of each drive are addressable.
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Q) 3.6 Which is better, SCSI or IDE or ESDI?

moons.Com - Reviews of the Saturn Aftermarket
Again like the MCA versus ISA/EISA/VLB/PCI debate. There is what is better in theory and what is better in real life. ESDI is a dead standard with much faster and larger capacity, cheaper IDE drives out there, though it had the possibility of being the fastest. Unfortunately in the PS/2 arena you usually can't chose IDE which with the newer versions offers almost all of the speed of the best SCSI drives and still is the fastest single user, single task OS drive there is.
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Table of Contents QUESTION: Can I have both IDE/ATA drives and SCSI in the same system?

scsifaq
The main issue is which device will be used for booting the system. Under MSDOS, The system BIOS determined this completely. A couple third party BIOSes (like MRBIOS) allowed the user to choose the boot source, but most conventional BIOSes just booted from the IDE if it was present. If no IDE was present then the standard option card BIOS scan would find the SCSI card's BIOS and use it to boot. Under Windows 95 and Windows NT, there are more options.
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QUESTION: What are the pros and cons regarding SCSI vs IDE/ATA ?

SCSI FAQ
Inexpensive due to high volume of production and simplified firmwar development and testing requirements. Very limited device attachment (two drives (including CDROMs) per channel, and two channels per system max.) (Recent versions of Linux (and I hear Win NT) support four or more ATA adapters) CPU is tied up transferring all data (actually newer EIDE controllers can do DMA as well if special drivers are loaded) All commands can overlap with commands on other devices.
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Why does Windows 2000 Device Manager list my IDE devices as SCSI devices ?

VIA Arena - FAQ Section
In the Windows 2000 hierarchy of device recognition, IDE An acronym for either Intelligent Drive Electronics or Integrated Drive Electronics. An IDE interface is an interface for mass storage devices, in which the controller is integrated into the disk or CD-ROM drive. is located lower than SCSI. Therefore all third-party vendor IDE An acronym for either Intelligent Drive Electronics or Integrated Drive Electronics.
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Q) 3.2 How can I tell if I have MFM/RLL/ESDI/IDE/SCSI?

moons.Com - Reviews of the Saturn Aftermarket
Open the computer and check the model number of the drive and contact the manufacturer is the only way to be 100% certain in many cases. That aside, the first thing to check is the number of pins on the drive's connector(s) and how many cables you have. The second thing to check is the CMOS setup, assuming, of course, that it is in a working system.
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Q) 3.7 Can MFM/RLL/ESDI/IDE and SCSI coexist?

moons.Com - Reviews of the Saturn Aftermarket
The PC is limited to two drive controllers total. SCSI, however, is a "host adapter" and not a drive controller. To the rest of your system, it appears more like an Ethernet card than a drive controller. For this reason, SCSI will always be able to coexist with any type drive controller. The main drawback here is that on most systems, you must boot off a disk on the primary drive controller, if you have one.
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SCSI interface? If I do, where can I get one?

Apple II Csa2 FAQs: 1Main-Start, Part 1/25 - Apple
The TWGS-2B GAL was a DMA fix Applied Engineering issued for the board. It is an absolute requirement for Transwarp to work at all with at least some RamFAST SCSI boards (e.g. the revision C boards). With Applied Engineering long since out of business and the GAL virtually impossible to duplicate by convential means, that leaves no good source for replacement GALs.
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Q) 3.1 How do IDE/MFM/RLL/ESDI/SCSI interfaces work?

moons.Com - Reviews of the Saturn Aftermarket
Ok, first FM, MFM, and RLL refer to the data encoding. Almost all drives today are RLL. IDE, ESDI, and SCSI are types of interfaces and the drives that run on them. The descriptions below will contain a lot of techno-babble to most, but the purpose of this is to give an idea how they work and in that capacity the text below should suffice. UPGRADING AND REPAIRING PC'S by Scott Mueller describes this much better as that is the purpose of his book, not this FAQ.
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What is SCSI?

Mendax - Frequently Asked Questions
This acronym is pronounced "scuzzy" and stands for Small Computer Systems Interface. There are now three types of interfaces for hard drives, CD-ROM drives, etc. One is SCSI, another is IDE (also called PATA, Paralle ATA) and the newest one which replaced IDE is called SATA (Serial ATA). IDE and SATA are much more common and less expensive. SCSI is more expensive and also more flexible and generally faster.
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PCICASE GROUP -- CASES AND STORAGE PROFESSIONAL
SCSI stands for Small Computer Systems Interface and is basically a connection standard for all kinds of devices like harddisks, tape drives and CD-ROM's. It uses components that are different from IDE. SCSI had different standards, the biggest differences are the databus width and the maximum transfer speed, the databus can be 8 or 16 bits wide, the transfer speed can go up to as far as 320MB/s. There are many different cables and connectors for different SCSI standards.
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What is an IDE?

Columbia University Medical Center IRB - Columbia University...
Investigational Device Exemption (IDE) is the mechanism by which new medical devices that could impose "significant risk" to patients/subjects are tested in the U.S. An IDE allows an investigational device to be utilized in a study in order to gather information on the safety and efficacy (effectiveness) of the device. An IDE is also required for an approved device which is being used off-label in a research study. Additional information is available on the FDA website: http://www.fda.
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Sophos Anti-Virus FAQ | Technology Services
IDE stands for Virus Identity Files (yeah, it doesn’t really make sense, but that’s how Sophos refers to them). These are the tools the program uses to tell when something on your computer is a virus, worm, Trojan horse, or other malware. Sophos checks for IDE updates every time you connect to the Internet and every two hours while you’re connected.
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Will DBAN work with my offboard IDE or IDE-RAID controller?

Darik's Boot and Nuke FAQ
Note, however, that most IDE-RAID devices are not really hardware implementations. DBAN uses these devices as regular IDE controllers.
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Why don't the T3 SATA bridge and T5 IDE bridge have ventilation slots like the T4 SCSI bridge?

Tableau Frequently Asked Questions
The T4 SCSI bridge consumes approximately 50% more power than the T3/T3u SATA and T5 IDE bridges. When Tableau's engineers designed the T4 they decided that the extra heat dissipated by the T4 warranted the addition of ventilation slots. While the T3/T3u and T5 do not generate enough heat to require ventilation, Tableau has decided to standardize future case production and all products will incorporate ventilation slots beginning in late 2004.
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What do the SCSI ID numbers mean?

Apple II Csa2 FAQs: 1Main-Start, Part 1/25 - Apple
SCSI ID numbers identify devices on the SCSI chain. Each device should have its own, unique ID number in the range 0-7. (If two devices on the SCSI chain have the same ID number, there will be a conflict and your system will not function correctly.) Higher numbered devices have higher priority-- get 'looked for' first-- so, it is standard practice to set the device you boot from to 6 or 7.
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What is SCSI "termination power"?

Apple II Csa2 FAQs: 1Main-Start, Part 1/25 - Apple
least one device (SCSI card or any SCSI drive) must provide power for the SCSI terminators by feeding 5 volts onto the TERMPWR line on the SCSI bus. Usually, termination power is fed through a diode to prevent backfeeding from a higher voltage source in case some other device is also supplying termination power. A good implementation will have a fuse to protect against shorts and a capacitor to cope with a sudden rise in termination power drain.
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How can I tell which Apple SCSI card I have?

Apple II Csa2 FAQs: 1Main-Start, Part 1/25 - Apple
The Apple High Speed SCSI card has a set of Dip Switches on it; the Rev C doesn't, and the ROM chip date is older than 1989, if it shows at all. The Apple SCSI cards older than REV C don't work in my IIe or IIgs...... The Apple High Speed SCSI card has a printed label on one of the chips showing the name "Sandwich II" on it.
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