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Device configuration overlay (DCO) is a hidden area on many of today's hard disk drives (HDDs). Usually when information is stored in either the DCO or host protected area (HPA), it is not accessible by the BIOS (or UEFI), OS, or the user. However, certain tools can be used to modify the HPA or DCO.
At the time, the HD20 Startup disk came with HFS and a new ".Sony" driver that supported 800K drives (in addition to the HD20). Ironically, though the drive would prove to be significantly faster than the previous 400-kilobyte drive, it was specifically slowed down to accommodate the slower 1-megahertz processor of the Apple II.
PSDs, while much bigger and heavier than ultracompact flash drives such as USB flash drives and memory cards, offer significantly more external storage capacities, yet are still convenient enough for carrying around when travelling or as a readily accessible offline backup storage option, especially in situations where online storage ...
Fusion Drive is a type of hybrid drive technology created by Apple Inc. It combines a hard disk drive with a NAND flash storage ( solid-state drive of 24 GB or more) [ 1 ] and presents it as a single Core Storage managed logical volume with the space of both drives combined.
Apple File System was announced at Apple's developers’ conference (WWDC) in June 2016 as a replacement for HFS+, which had been in use since 1998. [11] [12] APFS was released for 64-bit iOS devices on March 27, 2017, with the release of iOS 10.3, and for macOS devices on September 25, 2017, with the release of macOS 10.13.
The type of drive. 0xF8 is used to denote a hard drive (in contrast to the several sizes of floppy). 0x16 2 bytes 0x0000 Unused This field is always 0 0x18 2 bytes 0x003F Sectors Per Track The number of disk sectors in a drive track. 0x1A 2 bytes 0x00FF Number Of Heads The number of heads on the drive. 0x1C 4 bytes 0x0000003F Hidden Sectors
Use a removable USB flash drive to transfer the file onto another computer. Sign in to Desktop Gold on the second computer. Click the Settings icon. While in General settings, click the My Data tab. Click Import. Select the file you moved over using the USB flash drive. If prompted, enter the password you created for this export file.
If the value in the register is set to less than the actual hard drive size then effectively a host protected area is created. It is protected because the OS will work with only the value in the register that is returned by the IDENTIFY DEVICE command and thus will normally be unable to address the parts of the drive that lie within the HPA.