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Medalist Pro 7200 RPM and Ultra DMA

Seagate Technology has confirmed an issue when using three of our drive models in Ultra DMA mode. This issue only occurs on the drive models listed and only under specific conditions. This issue only affects a small sub-set population of the models mentioned. Only early production drives are affected by this issue; currently shipping drives are not affected.

What is the issue?

An issue with data transfer occurs in Windows 95 and Windows NT when bus mastering drivers have been loaded into the operating system and the ATA controller has been configured for Ultra DMA support. Windows 98 automatically loads Ultra DMA drivers during the installation if the proper chipsets are found during the hardware search. If the ATA controller has been configured for Ultra DMA support, then the Windows 98 installation may fail.

This issue has occurred when using several different motherboards that have integrated Ultra DMA compatible controllers.

What drive models are affected?

Only a small number of drives with the following drive model numbers are affected. The following models are the only Seagate drives affected by this issue.

  • ST39140A
  • ST36530A
  • ST34520A

If my drive is one of the affected models, what do I do?

If you are experiencing difficulty with one of the drives listed above and have or anticipate upgrading to a motherboard with integrated Ultra DMA support, please call Technical Support or email our Disc Support team for more information and help resolving this issue.

What workaround is available?

Until contacting our Technical Support department, disable Ultra DMA support at the controller or operating system level.


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