What is the Firmware of the Hard Drive?

Firmware is the OS of the hard disk. Firmware is installed on a small memory chip in the hard drive and is used to guide the hard drive to work.

Table of Contents

Preparation for reading: Often you will hear the term firmware, upgrade firmware, etc., so what is the hard drive’s firmware? Not quite appropriate but after all well understood is: that firmware is the operating system of the hard disk. Firmware is installed on a small memory chip in the hard drive and is used to guide the hard drive to work.

From DiskMFR

When we are in contact with computer products, we often hear professional terms such as brush firmware and upgrade firmware, so what is the firmware of the hard disk?


What is the Firmware of the Hard Drive?

Firmware is “software cured in hardware”, which is not quite right but after all good to understand: firmware is the operating system of the hard drive. Firmware is a small memory chip that is installed on the hard drive and is used to guide the hard drive to work.

It serves as the most basic and lowest level of a system. The hard drive firmware can be understood in this way: assuming that the hard drive is a computer host, the firmware is equivalent to the BIOS and operating system program, which contains the boot commands, control statements, and execution statements written in assembly language to coordinate and control the interaction between the internal components of the hard drive.

Although the name “firmware” is used, it should be understood as software, and due to the current progress in integrated circuits, upgrading firmware is becoming easier and easier, and the difference between firmware programs and what we usually call programs is becoming smaller and smaller.

Firmware location

For where the firmware is stored, different brands of hard drives vary. Some hard drives are partially saved in the chip of the board and partially saved in the negative track, the track before the zero track, while others save all firmware information in the negative track.

The firmware area is inaccessible in the normal operating state of the drive. Only through professional tools that transfer the hard drive to the factory technical state can the hard drive be implemented to read and write firmware area information, obtain firmware area modules and table configuration diagrams, obtain sector allocation tables, perform LBA (logical address) and CHS (physical address) swapping, perform low-level formatting, and read and write the hard drive’s flash memory chips and other operations.

Firmware composition

The hard drive firmware is divided into several different work areas. Different brands and models of hard drives have different work areas, and the modules that make up the different work areas also vary, with some hard drives having only two work areas, A and B, while others have three work areas, A, B, and C.

The firmware information of a hard drive is represented in modules, which may record one piece of information per module or multiple pieces of information in one module. These modules are not uniform in size, with some modules containing only a few bytes and others reaching tens of bytes, and they are not stored consecutively but have their own fixed locations. Hard disk firmware information modules include management modules, configuration and setup tables, defect lists, job log tables, etc., which will be introduced in the next issue.

Firmware upgrade


We mentioned earlier that firmware is software despite the name firmware, so it is easy to understand how firmware updates work. Using a new version of firmware allows the performance of the disk to improve, just like we update the software version.

Also, in many digital products, there is the concept of firmware, all the same.

DiskMFR Field Sales Manager - Leo

It’s Leo Zhi. He was born on August 1987. Major in Electronic Engineering & Business English, He is an Enthusiastic professional, a responsible person, and computer hardware & software literate. Proficient in NAND flash products for more than 10 years, critical thinking skills, outstanding leadership, excellent Teamwork, and interpersonal skills.  Understanding customer technical queries and issues, providing initial analysis and solutions. If you have any queries, Please feel free to let me know, Thanks

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