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VirtualBox is an x86 virtualization software package, originally created by German software company innotek, now developed by Sun Microsystems as part of its Sun xVM virtualization platform. It is installed on an existing host operating system; within this application, additional operating systems, each known as a Guest OS, can be loaded and run, each with its own virtual environment.

Supported host operating systems include Linux, Mac OS X, OS/2 Warp, Windows XP or Vista, and Solaris, while supported guest operating systems include FreeBSD, Linux, OpenBSD, OS/2 Warp, Windows and Solaris.

NEW IN VERSION 2.0.4
•VMM: better error reporting for VT-x failures
•VMM: don’t over flow the release log with PATM messages (bug #1775)
•VMM: fixed save state restore in real mode (software virtualization only)
•GUI: work around a Qt bug on Mac OS X (bug #2321)
•GUI: properly install the Qt4 accessible plugin (bug #629)
•SATA: error message when starting a VM with a VMDK connected to a SATA port (bug #2182)
•SATA: fixed Guru mediation when booting OpenSolaris/64; most likely applies to other guests as well (bug #2292)
•Network: don’t crash when changing the adapter link state if no host driver is attached (bug #2333)
•VHD: fixed bug which prevents booting from VHD images bigger than 4GB (bug #2085)
•VRDP: fixed a repaint problem when the guest resolution was not equal to the client resolution
•Clipboard: don’t crash when host service initialization takes longer than expected (Linux hosts only; bug #2001)
•Windows hosts: VBoxSVC.exe crash (bug #2212)
•Windows hosts: VBoxSVC.exe memory leak due to a Windows WMI memory leak (Vista only) (bug #2242)
•Windows hosts: VBoxSVC.exe delays GUI startup
•Solaris hosts: fixed host or guest side networking going stale while using host interface networking (bug #2474)
•Solaris hosts: added support for using unplumbed network interfaces and Crossbow Virtual Network Interfaces (VNICs) with host interface networking
•Solaris hosts: reworked threading model improves performance for host interface networking
•Windows additions: fixed crash when accessing deep directory structures in a shared folder
•Windows additions: improved shared folder name resolving (bug #1728)
•Windows additions: fixed Windows 2000 shutdown crash (bug #2254)
•Windows additions: fixed error code for MoveFile() if the target exists (bug #2350)
•Linux additions: fixed seek() for fales bigger than 2GB (bug #2379)
•Linux additions: support Ubuntu 8.10
•Web services: improved documentation and fixed example (bug #1642)

Program has 2 levels:

Drive level testing
- main function is testing and repair (regenerates) bad sectors for detected devices
- you get many information about detected devices

File level testing
- read/find/check items (MBR, boot, directories, etc.) of file system FAT12/16/32
- check/remove (regenerates) bad sectors records, flags in FAT table

Features:

* fully implemented commands: SET MAX, SET SECURITY, Device Configuration Overlay
* device access with interrupt 13h, direct via ATA ports, with ASPI drivers
* detects ATA/ATAPI/SATA/SATA with NCQ devices with on-board and add-on controller cards
* detects USB devices via USB ASPI driver only
* detects SCSI hard drives via INT13h or ASPI drivers
* other SCSI devices are detected via ASPI drivers only (must be loaded before)
* with ASPI drivers you got more informations about SCSI devices
* test and repair device for bad sectors
* many different test-functions for hard drives
* resize hard drives which supports SET MAX ADDRESS/EXT (supports 28/48-bits LBA addressing modes)
* drive lock detection via security feature (Security Menu)
* S.M.A.R.T. functions for ATA/SATA and SCSI/USB drives only
* informations about devices (ATA/ATAPI, INT13h, ASPI)
* sector viewer for devices (also for ZIP, CD-data discs)
* to access ATA/SATA CD-ROM drive you don’t need any driver or MSCDEX
* enable/disable some features for direct-access devices
* Device Configuration Overlay (DCO) feature set (you can restore a full capacity or allow/disallow some feature sets of hard drive)