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EIDE & SCSI Hardisks

The hardisk is one of the weakest links in the computer and it has a great impact on overall system performance. Much time is wasted as the processor sits around waiting for the hardisk to feed it data. I don't have many hardisks and here are just a few benchmarks I have run on the hardisks that are avaliable to me. I use the CheckHD 0.99c programme to benchmark the hardisks.

1. Quantum Fireball TM 3200AT
2. Quantum Fireball 1280AT
3. Seagate ST3145A

The test system is as follows

CPU: Cyrix 6x86 P200+ (75x2)
Motherboard: Abit SM5
Chipset: Intel Triton VX
Level 2 Cache: 512Kb Pipeline Burst
Main Memory: 32Mb 10ns Fujitsu SDRAM
Video Card: Diamond Stealth 2000 3D
Video Memory: 2MB EDO DRAM
Monitor: Sony SFII 15" Trinitron
CD-ROM: Optics Storage Maverick 16x


Hardisk Size/Mb Rotational Speed/RPM Overall Score
Quantum Fireball TM 3200AT 3200 4500 2.35
Quantum Fireball 1280AT 1280 5400 2.65
Seagate ST3145A 130 ? 1.00

The 2.65 score of the Fireball 1280AT does not tally with the score published by the author of CheckHD (2.40). The reason I was given when I emailed the author was that the programme was "over compensating" for a certain factor. Even the 2.35 scored by the Fireball TM 3200AT is higher than the 2.25 reported by the author. The same goes for the Seagate ST3145A... something special in my system perhaps? Sadly, the author of CheckHD is now suffering from RSI (repetitive stree injury) and is not able to make any modifications to the CheckHD programme. I wish him a speedy recovery!


Frequently Asked Questions About Hardisks

  • Interfaces

    There are 2 interfaces for hardisks: IDE and SCSI.

  • IDE (ATA)

    Short of Integrated Drive Electronics. Has 3 PIO modes.

    Mode 0: 3.3Mb/s
    Mode 1: 5.2Mb/s
    Mode 2: 8.3Mb/s

  • EIDE (ATA-2)

    An Enhanced version of IDE, this interface has a primary and a secondary channel that can be connected to two devices each, one as master and one as slave, for a total of four. EIDE controllers are integrated with the motherboard. ATAPI CD-ROMs can also use the EIDE interface. EIDE controllers are backward compatible with normal IDE devices. Has an additional 2 PIO modes over IDE.

    Mode 3: 11.1Mb/s
    Mode 4: 16.6Mb/s

  • Ultra DMA/33

    This is a new mode introduced by Quantum with a maximum transfer rate of 33.3Mb/s. It uses the IDE interface. Ultra DMA/33 hardisks can be used on normal EIDE controllers, but will run only in mode 4. To gain the full benifits of Ultra DMA/33, an Ultra DMA/33 controller is needed. Not only is this mode faster, but it also supports error checking.

  • SCSI

    Very expensive compared to EIDE, it is used in high performance setups and is able to daisy chain up to 7 devices on the same channel (8bit) or up to 15 devices on the same channel (16bit), the SCSI interface has 2 variants: 8-bit (50 wire data cable) and 16-bit (68 wire data cable). To further complicate things, it comes in different clock speeds:

    1. 5MHz [SCSI 1] - Up to 10Mb/s
    2. 10 MHz [Fast SCSI] - Up to 20Mb/s
    3. 20 MHz [Fast-20 / Ultra SCSI] - Up to 40Mb/s
    4. 40 MHz [Ultra-2 SCSI] - Up to 80Mb/s

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    All content on this web page and its related pages is copyright © 1996-97 by Duane Bong.

    Last modified on September 17, 1997