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Getting Started with Oracle VM VirtualBox by Pradyumna Dash

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Hard disk controllers

If we look at the physical servers or computers, all the devices (for example, DVD drives and hard drives) are connected to the physical hard disk controller, which is responsible for all the I/O operations of these devices. In contrast, VirtualBox emulated these hard disk controllers. VirtualBox emulates the most commonly used hard disk controllers such as IDE, SATA, SCSI, and SAS, which are described as follows:

  • IDE (ATA): This was the most widely used controller standard, but it has certain limitations and is now being replaced by the SATA standard. These controllers are backward compatible. So, if a guest operating system doesn't support SCSI or SATA, it would fall back to use IDE (ATA). For each guest VM in VirtualBox, ...

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