Search results
Results from the WOW.Com Content Network
On SCSI hard disk drives, the SCSI controller can directly control spin up and spin down of the drives. Some Parallel ATA (PATA) and Serial ATA (SATA) hard disk drives support power-up in standby (PUIS): each drive does not spin up until the controller or system BIOS issues a specific command to do so. This allows the system to be set up to ...
Non-RAID drive architectures also exist, and are referred to by acronyms with tongue-in-cheek similarity to RAID: JBOD (just a bunch of disks): described multiple hard disk drives operated as individual independent hard disk drives. SPAN or BIG: A method of combining the free space on multiple hard disk drives from "JBoD" to create a spanned ...
Depending on the fraction of data in relation to capacity, it can survive up to three drive failures, [citation needed] if the "array" can be restored onto the remaining good disks before another drive fails. The amount of usable storage can be approximated by summing the capacities of the disks and subtracting the capacity of the largest disk.
drive bay A standard-sized area within a computer case for adding hardware (hard drives, CD drives, etc.) to a computer. dual in-line memory module (DIMM) A series of dynamic random-access memory integrated circuits. These modules are mounted on a printed circuit board and designed for use in personal computers, workstations and servers ...
SFF-8301 includes drive heights of 17.80, 26.10, and 42.00mm, but as of 2025, no drives are produced in 42mm height. Drives with heights not mentioned in SFF-8301 are manufactured, e.g. Seagate 19.99-mm-high drives [5] and a Samsung low-profile single-disc drive with a height of 18.288 millimetres (0.72 in). [3]
The capacity of hard drives has grown exponentially over time. When hard drives became available for personal computers, they offered 5-megabyte capacity. During the mid-1990s the typical hard disk drive for a PC had a capacity in the range of 500 megabyte to 1 gigabyte. [6] As of February 2025 hard disk drives up to 36 TB were available. [7]
This means the heads cover more distance per unit of time on the outer tracks than on the inner tracks. This method is typical with computer hard drives. Constant linear velocity (CLV) keeps the distance covered by the heads per unit time fixed. Thus the disk has to slow down as the arm moves to the outer tracks. This method is typical for CD ...
The flying height or floating height or head gap is the distance between the disk read/write head on a hard disk drive and the platter.The first commercial hard-disk drive, the IBM 305 RAMAC (1956), used forced air to maintain a 0.002 inch (51 μm) between the head and disk.