atazz – ATA target control

atazz [ –r ] [ sddev ]
atazz –c cmd

Atazz is an interactive program for exercising raw ATA devices. Its intended purpose is to support odd and administrative commands without requiring this functionality be implemented by each device driver. It reads commands from standard input and applies them to an ATA target. Communication is in SATA FIS format. Non–ATA devices accessed through the sd(3) interface will not work; ATAPI devices will respond to the commands in the ACS–2 packet feature set. If the –c option is given, the name of the given numeric ATA command is printed. sddev is given on the command line, an open (see below) is immediately applied to the target. On completion of a command, any errors are printed followed by the prompt az> . The response FIS may be printed with the command rfis. Some commands like identify device print processed output by default. Redirecting the output to a file will give the raw output as will the –r flag. In addition the following commands are implemented internally
< > <> file     Redirect output, input or both to or from a file. If file is missing, then the redirection is closed.
close         Close the currently open device.
dev          Print device path and basic information.
issuetr [ command ... ]
Toggle command issue tracing. With no arguments, issuetr toggles tracing for all commands. Commands may be specified by number.
open dev       Open the named device.
probe         Print a list of available device paths, size, sector size and WWNs. The first column is a suitable argument for open.
rfis          Print the returned FIS, if any.

For all commands, it is possible to manipulate the sata registers directly by specifying the register name and an 8–bit value. The registers are
type       FIS type
flags      FIS flags
cmd        command register
feat       or features
or sector
or cyl0
or cyl8
or dh or byte8
sector count
reserved FIS register

In addition, commands that take an LBA and a number of sectors may be given those arguments directly, for example to read 1 sector starting at lba 100,
az> read dma ext 100 1

Subcommands are spelled out as in ACS–2. For example, to set the transfer mode to UDMA 6, enable the write cache and to enable and report smart status, one would
az> set features set transfer mode udma 6
az> set features enable write cache
az> smart enable operations
az> smart return status

SCT pseudo–protocol commands are also supported.
az> sct error recovery time set read timer = 5
az> sct error recovery time return read timer



scuzz(8), sd(3), smart(8),
T13/2015 ACS–2 published online at

Subcommand help doesn't work. ACS–2 commands are tortuously verbose.