d Get/set the "using_dma" flag for this drive. The -S, -y, -Y, and -Z options can be used to manipulate the IDE power Mode, drive has spun down), or sleeping (lowest power mode, drive is completely C Check the current IDE power mode status, which will always be one of unknown (driveĭoes not support this command), active/idle (normal operation), standby (low power That "32-bit" refers to data transfers across a PCI or VLB bus to the interfaceĬard only all (E)IDE drives still have only a 16-bit connection over the ribbon Works with nearly all 32-bit IDE chipsets, but incurs slightly more overhead. Transfers with a special sync sequence required by many chipsets. Currently supported values include 0 to disableģ2-bit I/O support, 1 to enable 32-bit data transfers, and 3 to enable 32-bit data
A numeric parameter can be used toĮnable/disable 32-bit I/O support. Management altogether on the drive (not all drives support disabling it, but most A value of 255 tells hdparm to disable Advanced Power Power management is attained with a setting of 1, and the highest I/O performance Values 128 through 254 (which do not permit spin-down). Possible settings range from values 1 through 127 (which permit spin-down), and Means aggressive power management and a high value means better performance. B Get/set Advanced Power Management feature, if the drive supports it. A Get/set the IDE drive´s read-lookahead feature (usually ON by default). Separate built-in read-ahead function, which augments this filesystem (software) Performance in sequential reads of large files, by prefetching additional blocks inĪnticipation of them being needed by the running task. a Get/set sector count for filesystem (software) read-ahead. d) will query (get) the device state, and with a parameter When no options are given, -acdgkmur is assumed. Some options may work correctly only with the latest recent WD "Passport" modelsĪnd recent NexStar-3 enclosures. Translation) and therefore may also work with hdparm. (2008 and later) USB drive enclosures now also support "SAT" (SCSI-ATA Command
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Linux SATA/PATA/SAS "libata" subsystem and the older IDE driver subsystem. Hdparm - get/set SATA/IDE device parametersĭESCRIPTION hdparm provides a command line interface to various kernel interfaces supported by the
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