The HDD's electronics control the movement of the actuator and the rotation of the disk and perform reads and writes on demand from the disk controller. There are two read-write heads for each platter, one to read the top surface and one to read the bottom, so a hard drive that has five platters say would need ten separate read-write heads.
Sequential changes in the direction of magnetization represent binary data bits. There are more thanworkers employed by the industry and more thanmillion Baht worth for export values.
A tiny piece of dust can make the read-write head bounce up and down, crashing into the platter and damaging its magnetic material. One of them is that hard drives can go wrong if they get dirt or dust inside them.
SSDs are becoming increasingly popular and are quickly gaining market share in the storage devices market.
Controllers are either built into the disk drive's own circuit board or part of the computer's main board motherboard. RAID subsystems are multiple drives that appear to be one drive or more drives to the user, but provide fault tolerance.
Reading and writing data The most important thing about memory is not being able to store information but being able to find it later.
How a hard drive works In your computer's hard drive, there aren't really any iron nails. As you'll have gathered from what you've just read, a hard drive is a wonderful bit of precision engineering with plenty of intricate moving parts.
You need to find a row of seven unused nails. As a consequence, not all the space on an HDD is available for user files, but this system overhead is usually small compared with user data. An actuator arm or access arm moves the heads on an arc roughly radially across the platters as they spin, allowing each head to access almost the entire surface of the platter as it spins.