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TestDisk is a free and open-source data recovery utility that helps users recover lost partitions or repair corrupted filesystems. [1] TestDisk can collect detailed information about a corrupted drive, which can then be sent to a technician for further analysis.
PowerFlex software takes each data chunk to be written and spreads it across many nodes, mirroring it as well. This makes data rebuilds from disk loss very fast as several nodes contribute their own smaller, faster and parallel rebuild efforts to the whole. PowerFlex supports VMware, Hyper-V, Xen and KVM hypervisors.
VMDK (short for Virtual Machine Disk) is a file format that describes containers for virtual hard disk drives to be used in virtual machines like VMware Workstation or VirtualBox.
backups to disk on-site (copied to off-site disk) or off-site; replication off-site, such that once the systems are restored or synchronized, possibly via storage area network technology; private cloud solutions that replicate metadata (VMs, templates and disks) into the private cloud.
On Windows NT operating systems, CHKDSK can also check the disk surface for bad sectors and mark them (in MS-DOS 6.x and Windows 9x, this is a task done by Microsoft ScanDisk). The Windows Server version of CHKDSK is RAID-aware and can fully recover data in bad sectors of a disk in a RAID-1 or RAID-5 array if other disks in the set are intact. [11]
The absence of moving parts in USB flash devices allows true random access, thereby avoiding the rotational latency and seek time (see also mechanical latency) of hard drives or optical media, meaning small programs will start faster from a USB flash drive than from a local hard disk or live CD.
VMware VMFS (Virtual Machine File System) is VMware, Inc.'s clustered file system used by the company's flagship server virtualization suite, vSphere. It was developed to store virtual machine disk images, including snapshots. Multiple servers can read/write the same filesystem simultaneously while individual virtual machine files are locked.
VMware Workstation supports bridging existing host network adapters and sharing physical disk drives and USB devices with a virtual machine. It can simulate disk drives; an ISO image file can be mounted as a virtual optical disc drive , and virtual hard disk drives are implemented as .vmdk files.