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= <span id="KB102376"></span>4MMDAT.SYS Driver Does Not Recognize IBM 4 mm Drive =<br />
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Article ID: 102376<br />
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Article Last Modified on 11/1/2006<br />
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APPLIES TO<br /><br />
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* Microsoft Windows NT Advanced Server 3.1<br />
* Microsoft Windows NT Workstation 3.1<br />
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This article was previously published under Q102376<br />
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== SYMPTOMS ==<br />
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The 4MMDAT.SYS driver does not recognize the IBM 4 millimeter (mm) drive.<br />
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== CAUSE ==<br />
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The 4MMDAT.SYS driver is the tape driver for several 4 mm tape drives, including Archive, WanDat, Exabyte, and Hewlett-Packard (HP).<br /><br />
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All of these drives support some vendor-unique functions that are the standard for this device type. The 4MMDAT.SYS driver uses these functions to do positioning. When the driver was designed, all drives known at that time supported these vendor-unique functions, but since that time, it has been found that the IBM 4 mm drive does not support them, instead it uses the SCSI2 standard functions. Because of this, the 4MMDAT.SYS driver does not recognize the IBM drive.<br />
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== RESOLUTION ==<br />
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The IBM drive has a separate driver, the 4MMIBM.SYS. It is located in the OEM drivers directory on the following release:<br />
<pre class="fixed_text"> drvlib\storage\ibm_4mm<br />
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Additional query words: prodnt<br />
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Keywords: kbother KB102376<br />
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