Ata 66: The Specification — Ultra ATA/66 Technology Review

24 декабря, 2022

What is ATA/66?

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Advanced Technology Attachment (ATA) is an interface standard for connecting storage components to an IBM-type personal computer. ATA/66, standardized in 1999, is one variety.

The original ATA interface used parallel 40-wire cables and had the ability to host two drives on a single cable. This was accomplished using a master/slave configuration. This basic model endured through the ATA/33 specification. With the introduction of ATA/66, the 40-wire cables were replaced by 80-wire cables for even-faster data transfer speeds, theoretically reaching up to 66.6 megabytes per second (MBps). Both types of cables continued to use 40-pin connectors.

The many designations for the various flavors of ATA that developed over the years can be difficult to keep straight. Other designations for ATA/66 are ATA-5, the standard under which it falls, and Ultra ATA/66. The specification also corresponds with the Ultra Direct Memory Access (UDMA) 3-4 transfer modes. If this isn’t enough to confuse even a dedicated computer enthusiast, the name is sometimes used interchangeably with Enhanced Integrated Drive Electronics (EIDE) and ATA Packet Interface (ATAPI-5). The ATAPI-5 standard incorporates additional commands to control CD-ROMS and tape storage units that use the specification.

All parallel ATA cables are limited to 18-inches (45.7 centimeters) in length. This makes them bad candidates for external devices, and can also create difficulties inside the computer. The ultra-wide cables block airflow and are difficult to route.

This problem was eventually addressed by later-generation serial ATA (SATA). Four-wire SATA cables are thinner, with a smaller interface and greater data transfer speeds than original ATA. Original ATA is now referred to as parallel ATA (PATA) to differentiate it from SATA.

Older hard drives made to the ATA/66 specification still require legacy PATA cables. If upgrading to a SATA drive, computer users should be sure their motherboard supports SATA. Motherboards manufactured prior to 2004 might not include this support. Unlike ATA, SATA uses point-to-point control, meaning that each drive has its own cable. For this reason, SATA-enabled motherboards typically have several SATA interfaces, or the ability to run a redundant array of independent disks (RAID).

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Ultra-ATA/66 versus Ultra Wide SCSI hard drives

Ultra-ATA/66 versus Ultra Wide SCSI hard drives

 

 

Which
is faster, an Ultra-ATA/66 drive or an Ultra Wide SCSI
drive?

Revised 1/5/2000,
Originally Posted 12/24/99
© 1999 Rob Art
Morgan, editor of BARE FEATS
rob-art@barefeats. com

Ultra
Wide SCSI drives have a reputation for being the fastest. And it
costs you at least $650 for an Ultra Wide PCI controller board
with one 18 Gig Ultra Wide drive (see MacGurus). A comparable
ATA/66 controller and ATA/66 drive will cost you about $300. Is
the SCSI worth twice the cost? Let’s find out:

LONGER
BAR is FASTER. RED BAR IS FASTEST.

 

Conclusion
A single Ultra-Wide
SCSI drive on an Ultra Wide controller is no faster than a single
Ultra-ATA/66 drive on an Ultra-ATA/66 controller.

Is the SCSI worth twice
the cost? I don’t think so.

Comments
Now don’t email
me that the test was unfair. The SCSI drive was a 9 gig 10,000 rpm
Cheetah while both ATA/66 drives were 20 gig 7200 rpm models. Test
drives are hard to come by.

I’ll try to match the
drives more closely in future testing which will include dual
drives in a RAID array (both interfaces).

 

 

Test
Configurations & Procedures

  • All three drives were
    tested on a G4/400 Sawtooth with 256MB of RAM. Disk cache was set
    to 512K to purposely nullify the effects of disk caching on
    results.
  • Test drives
    included
    The Seagate
    Cheetah 9 gig 10,000 RPM Ultra Wide
    (ST39103LW) with Initio
    Miles2 Ultra2 adapter.
    The Seagate
    Barracuda 20 gig 7200 RPM ATA/66
    (ST320430A)
    The Western
    Digital Expert
    20 gig 7200 RPM ATA/66 (installed on Sawtooth G4/400 at the
    factory)
  • For the DUPLICATE
    THREE PHOTOS test, I copied a 27MB Adobe
    Photoshop
    document onto each drive and made two copies. Then I timed how
    long it took to duplicate the three 27MB docs on the same drive.
    Finally I calculated megabytes per second by with the formula:
    folder size * 2 / seconds.
  • For the DUPLICATE 91MB
    FOLDER test, I copied the Unreal Tournament Demo folder containing
    202 documents onto each drive. Then I timed how long it took to
    duplicate it on the same drive. Finally I calculated megabytes per
    second by with the formula: folder size * 2 / seconds.
  • The ATTO disk
    benchmark was run using Express-Pro
    Tools 2.2
    benchmark test with 8MB maximum file size and system disk cache
    disabled. Sustained Rate is displayed in the charts. Peak rates
    can be impressive but do not reflect typical drive
    performance.

 

BIG
MAHALO TO…

…MacGurus
for the use of the Seagate
Cheetah and
Initio
Miles Ultra2.

GO
TO bare
feats HOME
PAGE

© 1999 Rob Art
Morgan, editor of BARE FEATS
Gotta Question? Comment? Want to advertise?
Email [email protected]

 

 

 

 

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Vintage 1998-99 / Promise ULTRA ATA 66 V1.14 EIDE Controller Card (bidding ended #95550536)

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