![]() ![]() Some of these controller chips can be configured to report part of the flash as a separate CD-ROM partition, or act like two separate USB storage devices. There is a controller chip in all flash drives that accepts USB commands from the host and talks to the raw flash inside on the host's behalf. You do NOT want to repeat this step as the act of writing to a bad block could prevent you from setting that particular bit again that identifies it as bad.īut you are not dealing with raw flash. Each "eraseblock" has an additional small "OOB" block that holds error correcting information - and this is where it is marked as bad. Raw flash needs a different initial preparatory step at the factory - each flash "eraseblock" (analogus to a "block" on disks) needs to be tested and marked as bad if it is indeed bad. Various other meanings include writing zeros to all blocks, configuring the drive to disable "hidden" areas such as HPA and DCO and then zeroing all blocks, or other things more related to partitioning than formatting. Modern IDE and SATA hard drives are low-level formatted too, but only at the factory. Early MFM and RLL PC hard drives could be low-level formatted, often using a utility built into the hard drive controller's (an ISA card) ROM. ![]() ![]() Low-level formatting a floppy prepares the disk to be able to read and write blocks. In this way the head can detect when it is A) on a track and B) where it is on the track. The original meaning was a step needed in the formatting of disks - disk drives need header, sync and other patterns written on the media before it can store data to it. Low-level formatting means many different things to different people and on different contexts. ![]()
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