What Is This Tool?
This tool converts data transfer rates from IDE (UDMA mode 4), a Parallel ATA transfer mode commonly used in late 1990s and early 2000s PCs, to SCSI (Fast Ultra), a parallel SCSI signaling mode used in higher-performance storage devices and servers.
How to Use This Tool?
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Enter the value in IDE (UDMA mode 4) units you want to convert
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Select IDE (UDMA mode 4) as the source unit and SCSI (Fast Ultra) as the target unit
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Click the convert button to see the equivalent value in SCSI (Fast Ultra)
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Use the results to compare or translate data transfer rates between devices
Key Features
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Converts data transfer units between IDE (UDMA mode 4) and SCSI (Fast Ultra)
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Supports benchmarking and comparison of legacy and modern storage technologies
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Easy-to-use browser-based interface for quick conversions
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Includes conversion formulas based on theoretical throughput values
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Relevant for configuring, troubleshooting, or maintaining storage hardware
Examples
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1 IDE (UDMA mode 4) equals 3.3 SCSI (Fast Ultra)
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2 IDE (UDMA mode 4) equals 6.6 SCSI (Fast Ultra)
Common Use Cases
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Connecting legacy PATA/IDE hard drives in older PCs
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Configuring or troubleshooting DMA modes in BIOS or firmware on vintage systems
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Benchmarking or maintaining legacy storage hardware
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Comparing data transfer rates when integrating IDE and SCSI devices
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Setting up high-performance SCSI hard-disk arrays and RAID controllers
Tips & Best Practices
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Always verify the physical interface compatibility before device integration
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Use this tool as a reference for theoretical throughput rather than real-world speeds
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Consider system firmware and hardware support when configuring transfer modes
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Consult device documentation to confirm transfer mode capabilities
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Use conversions to assist in benchmarking and data recovery tasks
Limitations
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Conversion is based on theoretical maximum throughput, ignoring real-world overhead
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Different interfaces and cabling standards limit direct hardware interchangeability
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Does not account for signal integrity or specific protocol latencies
Frequently Asked Questions
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What does IDE (UDMA mode 4) refer to?
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IDE (UDMA mode 4), also known as Ultra DMA/66 (ATA-4), is a transfer mode in the IDE/ATA standard that provides up to 66.7 MB/s throughput using an 80-conductor cable.
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What is SCSI (Fast Ultra)?
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SCSI (Fast Ultra) is a parallel SCSI signaling mode combining Fast and Ultra extensions to increase throughput and reduce latency while maintaining compatibility with the SCSI command set.
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Is the conversion exact for real-world device speeds?
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No. The conversion uses theoretical maximum rates and does not factor in overhead, latency, or hardware-specific limitations.
Key Terminology
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IDE (UDMA mode 4)
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A Parallel ATA transfer mode using Ultra DMA protocol with a theoretical throughput of about 66.7 MB/s, requiring an 80-conductor IDE cable.
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SCSI (Fast Ultra)
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Parallel SCSI signaling modes combining Fast and Ultra extensions to enhance throughput and reduce latency, compatible with the SCSI command set.
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Data Transfer Rate
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The amount of data moved between devices per unit of time, often measured in megabytes per second (MB/s).