On Linux, you can check the physical sector size and logical sector size of an HDD with the fdisk command. Physical Sector Size vs Logical Sector SizeĪlthough new hard drives use the 4K advanced format, operating systems still expect a 512 bytes sector size, so the firmware on the HDD divides a 4K physical sector into several logical sectors, typically 512 bytes. After January 2011, most new hard drives store 4096 bytes of data in one sector. In 2009 the industry devised the 4K sector size format known as the advanced format to improve disk reliability and increase capacity. Traditionally one sector stores 512 bytes of data. That is to say, even if you just need a portion of the data from a sector, the read-write head will read the entire sector to retrieve the data. A sector is the smallest unit for reading data from the disk. There are typically hundreds of sectors per track and each sector usually has the same length. Hint: Hard disk drives are very complex devices and can be easily damaged if you drop them to the ground.Įach track is divided into sectors. Each platter surface is divided into tens of thousands of tracks. Each platter is coated with a magnetizable material to record data. The Structure of Hard Disk DriveĪ hard disk drive usually has several circular platters stacked vertically with a spindle that rotates the disk in the center. A solid-state drive (SSD) is electronic disk. A hard disk drive (HDD) is magnetic disk. If you don’t care about those details, you can jump directly to the solution. I’m going to share with you what I did to fix the error, so if you are in the same situation, this article may help you.īut before doing that, I want to explain some basic knowledge about hard disk drives and filesystems on Linux, so you will really know what you are doing. Recently my Linux desktop computer can’t mount my 5TB external hard disk drive (HDD), and the file manager displays the “ can’t read superblock” error on the screen.
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