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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic id="virtio-scsi">
<title>Virtual I/O Device SCSI Hard Disk Controller</title>
<body>
<p>The use of hard disk controllers is described at <xref href="harddiskcontrollers.dita"/>. In addition to those listed, virtio-scsi is an experimental feature.</p>
<p><b outputclass="bold">Virtual I/O Device SCSI</b> is a standard to connect virtual storage devices like hard disks or optical drives to a VM. Recent Linux and Windows versions support these devices, but Windows needs additional drivers. Drivers are available from Oracle Support.</p>
<note>
<p>The virtio-scsi controller will only be seen by OSes with device support for it. In particular, <i>there is no built-in support in Windows</i>. So Windows will not see such disks unless you install additional drivers.</p>
</note>
<p>Up to 256 slots can be attached to the virtio-scsi controller, if enabled and supported by the guest OS.</p>
</body>
</topic>
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