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3 + 1 ⁄ 2-inch floppy disks have a sliding tab in a window on the right side (open = protected). Iomega Zip disks were write-protected using the IomegaWare software. Syquest EZ-drive (135 & 250 MB) disks were write-protected using a small metal switch on the rear of the disk at the bottom.
A block, a contiguous number of bytes, is the minimum unit of storage that is read from and written to a disk by a disk driver.The earliest disk drives had fixed block sizes (e.g. the IBM 350 disk storage unit (of the late 1950s) block size was 100 six-bit characters) but starting with the 1301 [8] IBM marketed subsystems that featured variable block sizes: a particular track could have blocks ...
Such a controller historically has been made in the form of a dongle that fits between a computer and an IDE or SCSI hard drive, but with the advent of USB and SATA, forensic disk controllers supporting these newer technologies have become widespread. Steve Bress and Mark Menz invented hard drive write blocking (US Patent 6,813,682). [1]
WORM drives preceded the invention of the CD-R, DVD-R and BD-R.An example was the IBM 3363. [1] These drives typically used either a 5.1 in (13 cm) or a 12 in (30 cm) disc in a cartridge, with an ablative optical layer that could be written to only once, and were often used in places like libraries that needed to store large amounts of data.
Formatting tools or non-DR SYS-type tools may clear these bits, but other disk tools should leave bits 15-8 unchanged. 0x02A 0x1F 2 Version (defined as 0.0). The high byte of the version number is stored at offset 0x02B, and the low byte at offset 0x02A. [4] FAT32 implementations should refuse to mount volumes with version numbers unknown by them.
YASU (Yet Another SecuROM Utility) is a very small tool that works as a SCSI-drive protector. It was created by sYk0 and can be used to hide emulated drives from SecuROM 7 and SafeDisc 4 . YASU is a companion program for Daemon Tools and currently being hosted, supported and maintained by the Daemon Tools team.
An alternative to MRW is to physically format a disc in UDF 1.5 or higher using the spared build. This is achieved by the use of specialized packet writing software, or operating systems that support UDF versions 1.5 and above. MRW capabilities overlap somewhat with that of UDF 1.5+. Information about the exact format on disc is sparse.
Drives with this capability are known as self-encrypting drives ; they are present on most modern enterprise-level laptops and are increasingly used in the enterprise to protect the data. Changing the encryption key renders inaccessible all data stored on a SED, which is an easy and very fast method for achieving a 100% data erasure.