Definition: A legacy hard drive parameter representing the number of cylindrical tracks on a disk platter.
Explanation
Cylinder count refers to the number of cylindrical tracks on a hard disk drive’s platters, used historically to describe the physical geometry of spinning disks. It was part of the cylinder-head-sector (CHS) addressing scheme that older systems used to locate data on hard drives. However, modern storage devices like USB flash drives use logical block addressing (LBA) and do not have physical cylinders or heads. The cylinder count is often simulated or translated by the device controller for compatibility but does not reflect actual physical storage layout in flash memory.
Example
When configuring a USB flash drive for booting on older hardware, adjusting the cylinder count setting is usually unnecessary because flash memory does not have physical cylinders. Instead, compatibility depends more on the USB transport protocol, such as Bulk-Only Transport (BOT) versus USB Attached SCSI Protocol (UASP).
Who This Is For
This term is relevant for IT professionals, system integrators, and technicians working with legacy BIOS systems, embedded devices, industrial equipment, or older imaging software that may still reference traditional hard drive geometry parameters.
Related Terms
head count, sector count, logical block addressing, BOT, UASP
Also Known As
cylinders