![]() ![]() Show that the drive is 48_bit capable, but -I will not Large drives, for compatibility (and loss of capacity) System vendors sometimes disable 48_bit addressing on When disabled, they are otherwise hiddenĪnd will not show in the -I identify output. ![]() Which might be disabled by the vendor for "enhancedĬompatibility". These settings show capabilities of the drive Settings which can be disabled by the vendor or OEM Query and dump information regarding drive configuration (or malware) from changing any DCO settings until after The -dco-freeze option will freeze/lock theĬurrent drive configuration, thereby preventing software Vendors to selectively disable certain features of aĭrive. YourĭCO stands for Device Configuration Overlay, a way for Slow things down (on really messed up hardware!). Which DMA does not make much of a difference, or may even But there areĪt least a few configurations of chipsets and drives for With fast I/O throughput and low CPU usage. Using DMA nearly always gives the best performance, Mode, although most BIOSs should do this for you at boot That the drive itself is programmed for the correct DMA It is also a good idea to use theĪppropriate -X option in combination with -d1 to ensure Interfaces which support DMA and which are known to the Now works with most combinations of drives and PCI d Get/set the "using_dma" flag for this drive. Options can be used to manipulate the IDE power modes. C Check the current IDE power mode status, which will alwaysīe one of unknown (drive does not support this command),Īctive/idle (normal operation), standby (low power mode,ĭrive has spun down), or sleeping (lowest power mode,ĭrive is completely shut down). (E)IDE drives still have only a 16-bit connection over the Note that "32-bit" refers to data transfersĪcross a PCI or VLB bus to the interface card only all The value 3 works with nearlyĪll 32-bit IDE chipsets, but incurs slightly more Support, 1 to enable 32-bit data transfers, and 3 toĮnable 32-bit data transfers with a special sync sequence A numeric parameterĬan be used to enable/disable 32-bit I/O support.Ĭurrently supported values include 0 to disable 32-bit I/O ![]() ![]() The drive (not all drives support disabling it, but most Hdparm to disable Advanced Power Management altogether on Is attained with a setting of 1, and the highest I/O Spin-down), and values 128 through 254 (which do not Settings range from values 1 through 127 (which permit A low value means aggressive power managementĪnd a high value means better performance. B Get/set Advanced Power Management feature, if the drive A Get/set the IDE drive´s read-lookahead feature (usually ONīy default). Many IDE drives also have a separate built-in read-aheadįunction, which augments this filesystem (software) read. Large files, by prefetching additional blocks inĪnticipation of them being needed by the running task. This is used to improve performance in sequential reads of a Get/set sector count for filesystem (software) read-ahead. Query (get) the device state, and with a parameter (e.g., -d0) Options, a query without the optional parameter (e.g. When no options are given, -acdgkmur is assumed. Some options may work correctly only with the latest kernels. recent WD "Passport" models and recent NexStar-3 enclosures. Many newer (2008Īnd later) USB drive enclosures now also support "SAT" (SCSI-ATAĬommand Translation) and therefore may also work with hdparm.Į.g. Subsystem and the older IDE driver subsystem. Interfaces supported by the Linux SATA/PATA/SAS "libata" SYNOPSIS top hdparm ĭESCRIPTION top hdparm provides a command line interface to various kernel Hdparm - get/set SATA/IDE device parameters HDPARM(8) System Manager's Manual HDPARM(8) NAME top ![]()
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