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Ultra ATA/100 Frequently Asked Questions

What is required to run in Ultra ATA/100 Mode?

Similar to Ultra ATA/66, there are basically four requirements:

  1. An Ultra ATA/100-capable system board and BIOS. (Ultra ATA/100 expansion cards are also available).
  2. An Ultra ATA-capable 40 pin, 80 conductor cable with the blue (system board), black (master) and gray (slave) connectors.
  3. An operating system capable of DMA transfers, such as a Windows OS.
  4. An Ultra ATA/100-capable device.

How do I know if my system can support the new Ultra ATA/100 products?
Please check with your preferred motherboard manufacturer or system manufacturer for Ultra ATA/100 support information.

Where can I get the Seagate Ultra ATA/100 toggle utility?

The utility (UATA100d.exe) can be downloaded from our Disk Utilities page. The file is a self-extracting Zip archive that must be unzipped and placed on a bootable diskette or just a blank, floppy diskette. This version of the utility can be used with all Ultra ATA/33, Ultra ATA/66, and Ultra ATA/100 capable Seagate ATA hard drives.

How can I run the Ultra ATA toggle utility using Windows Millennium (WinMe)?

Because WinMe does not offer a way to Restart in MS-DOS Mode, you can use a WinMe Startup Disk to boot the system to the A:> Prompt. A WinMe Startup Disk can be made using Control Panel-Add/Remove Programs-Startup Disk Tab-Create Disk. After downloading and expanding the toggle utility (UATA100d.exe), copy UATA100.exe and UATA100.txt onto the WinMe Startup Disk. Boot to the WinMe Startup Disk and type UATA100 <enter> at the A:> prompt to configure the drive.

Are the Ultra ATA/33, Ultra ATA/66 and Ultra ATA/100 interfaces backward compatible?

All Seagate Ultra ATA/100 drives are backward compatible with Ultra ATA/33, Ultra ATA/66, and legacy ATA interfaces. However, due to the inability of some ATA host controllers and motherboards to properly interface with Ultra ATA drives, Seagate suggests using the "toggle" utility to set the Ultra ATA/100 drives to Ultra ATA/33 or Ultra ATA/66 mode for better compatibility with a non-ATA/100 host controller or motherboard.

Will performance be affected if I have to set an Ultra ATA/100 disk drive to a slower speed in order to maintain compatibility with my system?

Changing the transfer mode affects only the external transfer rate of the device. If an Ultra ATA/100 device is configured for a slower transfer mode, its maximum speed will of course be limited to the maximum burst transfer rate of that mode. However, the internal performance is not affected by the external transfer mode, therefore the sustained transfer rate will not be as drastically affected as the maximum (burst) transfer rate.

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