---
title: "Disk Electronics (PCB) - Hard Drives (HDD) - EXALAB"
description: "Disk electronics (PCB) is a key component of hard drives (HDD), responsible for managing operations and computer system communication."
url: "https://www.exalab.cz/en/glossary/disk-electronics-pcb-hard-drives-hdd"
date: "2026-06-19T23:11:57+00:00"
language: "en-GB"
---

##  Disk Electronics (PCB) - Hard Drives (HDD)

The disk electronics, also known as PCB (Printed Circuit Board), represent a crucial component of hard drives (HDD). It is responsible for controlling their operations and communicating with the computer system. The PCB contains a number of key components, including an MCU (Microcontroller Unit, serving as a processor), ROM (Read-Only Memory), RAM (Random-Access Memory, used as cache to speed up disk operations), disk motor controllers, power circuits, and in some cases, a NAND flash memory chip, especially in SSHDs (Solid-State Hybrid Drives). The PCB also includes an interface for connecting the disk to a computer.

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