LBA Format 1 : Metadata Size: 0 bytes - Data Size: 4096 bytes - Relative Performance: 0x1 Better # nvme id-ns -H /dev/nvme0n1 | grep "Relative Performance" LBA Format 0 : Metadata Size: 0 bytes - Data Size: 512 bytes - Relative Performance: 0x2 Good (in use) To check the formatted logical block address size (FLBAS) of an NVMe drive, use the nvme-cli utility in addition with Identify Namespace command: Most solid state drives (SSDs) report their logical block address size as 512 bytes, even though they use larger blocks physically - typically 4 KiB, 8 KiB, or sometimes larger. # hdparm -I /dev/sd X | grep 'Sector size:' Logical Sector size: 4096 bytes # hdparm -set-sector-size 4096 -please-destroy-my-drive /dev/sd XĪfterwards, hdparm should report the logical sector size as 4096 bytes: Seagate drives advertising FastFormat support), you can use hdparm to change between the supported logical sector sizes. If your SATA HDD supports multiple logical sector sizes and the optional ATA command SET SECTOR CONFIGURATION EXT (e.g. E.g., an Advanced Format 512e drive:įor optimal performance on these types of drives, ensure the #dm-crypt sector size or #File systems block size is at least 4096 bytes and aligns to it.ĤKn drives already have the optimal configuration out of the box and do not need special considerations when partitioning/formatting. Hard disk drives which do not support multiple changeable logical sector sizes will simply report the current sector sizes. ![]() Note: For USB-attached drives, the USB bridge needs to support SAT aka SCSI/ATA Translation (ANSI INCITS 431-2007).Īdvanced Format drives whose Sector Configuration Log lists multiple logical sector sizes will show a list of them: # hdparm -I /dev/sd X | grep 'Sector size:' To determine if the sector size of an Advanced Format hard disk drive can be changed, use the hdparm utility: As an alternative, you can manually specify the desired sector size when creating file systems on the drive to get optimal performance. Follow #Intel to change their reported physical sector size.Ĭhanging the sector size of a drive is a complex process that requires low-level formatting. Exception are certain Intel SATA SSDs that can change the reported physical sector size, but not the logical sector size. SATA solid state drives typically do not support changing their sector size. While for NVMe solid state drives, both the logical and physical sector size values get changed. For hard disk drives this changes the logical sector size in order to match the physical sector size for optimal performance. Some NVMe drives and "enterprise" SATA hard disk drives support changing their reported sector size using standard NVMe ( Format NVM from NVM Command Set Specification 1.0 or later) or ATA ( SET SECTOR CONFIGURATION EXT from ATA Command Set - 4 or later) commands, respectively. Warning: Changing a drive's sector size will irrevocably erase all the data on the drive. The current physical and logical sector sizes values can be listed with lsblk: If they do not, the mapping process from the firmware's translation layer, although usually transparent, will result in overhead that can be avoided. ![]() The different "layers", namely the device, stacked block devices, and file systems, should utilize the same sector sizes. For example, an Advanced Format HDD with a physical sector size of 4096 bytes may still present a logical sector size of 512 bytes for compatibility with older systems and applications. The logical sector size can differ from the physical sector size. ![]() It is the sector size used for reading from and writing to the storage device at the software level. Logical sector size The logical sector size, also known as the operating system sector size, represents the size of the sectors exposed to the operating system and applications. For NVMe SSDs, if it is available, the Atomic Write Unit Power Fail (AWUPF) parameter value is used. SSDs do not expose their actual NAND flash memory page size, which typically ranges from 4 KiB to 16 KiB, instead their reported physical sector size is the same as their logical sector size. However, with the introduction of Advanced Format HDDs, the physical sector size was increased to 4096 bytes (4 KiB) for increased storage density and improved error correction capabilities. Traditionally, the physical sector size for HDDs was 512 bytes, meaning that each sector could hold 512 bytes of data. For HDDs, it is the actual size of sectors in a platter. Physical sector size This is the smallest unit a physical storage device claims it can write atomically. Note: Software and documentation may sometimes refer to "sectors" and "blocks" interchangeably, regardless of the storage type.
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