contains utilities that send SCSI commands to devices. Beta version.
| sg_dd.8 (sg3_utils-1.47r908.tgz) | : | sg_dd.8 (sg3_utils-1.47r915.tar.xz) |
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| skipping to change at line 305 | | skipping to change at line 305 |
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| OFILE doesn't exist then an error is generated. Without this f
lag a regular (empty) file named | | OFILE doesn't exist then an error is generated. Without this f
lag a regular (empty) file named |
| OFILE will be created (and then filled). For production quality sc
ripts where OFILE is a device | | OFILE will be created (and then filled). For production quality sc
ripts where OFILE is a device |
| node (e.g. '/dev/sdc') this flag is recommended. It guards a
gainst the remote possibility of | | node (e.g. '/dev/sdc') this flag is recommended. It guards a
gainst the remote possibility of |
| 'dev/sdc' disappearing temporarily (e.g. a USB memory key removed)
resulting in a large regular | | 'dev/sdc' disappearing temporarily (e.g. a USB memory key removed)
resulting in a large regular |
| file called '/dev/sdc' being created. | | file called '/dev/sdc' being created. |
| | |
| null has no affect, just a placeholder. | | null has no affect, just a placeholder. |
| | |
| random this flag is only active with iflag= and when given replaces if=I
FILE. If both are given an error | | random this flag is only active with iflag= and when given replaces if=I
FILE. If both are given an error |
| is generated. The input will be a stream of pseudo random bytes.
The Linux getrandom(2) system | | is generated. The input will be a stream of pseudo random bytes.
The Linux getrandom(2) system |
|
| call is used to create a seed and thereadter mrand48_r(3) is
used to generate a pseudo random | | call is used to create a seed and there after mrand48(3) is
used to generate a pseudo random |
| sequence, 4 bytes at a time. The quality of the randomness can be
viewed with the ent(1) utility. | | sequence, 4 bytes at a time. The quality of the randomness can be
viewed with the ent(1) utility. |
| This is not a high quality random number generator, it is built fo
r speed, not quality. One appli- | | This is not a high quality random number generator, it is built fo
r speed, not quality. One appli- |
| cation is checking the correctness of the copy and verify operatio
ns of this utility. | | cation is checking the correctness of the copy and verify operatio
ns of this utility. |
| | |
| sgio causes block devices to be accessed via the SG_IO ioctl rather t
han standard UNIX read() and | | sgio causes block devices to be accessed via the SG_IO ioctl rather t
han standard UNIX read() and |
| write() commands. When the SG_IO ioctl is used the SCSI READ and
WRITE commands are used directly | | write() commands. When the SG_IO ioctl is used the SCSI READ and
WRITE commands are used directly |
| to move data. sg devices always use the SG_IO ioctl. This flag off
ers finer grain control compared | | to move data. sg devices always use the SG_IO ioctl. This flag off
ers finer grain control compared |
| to the otherwise identical 'blk_sgio=1' option. | | to the otherwise identical 'blk_sgio=1' option. |
| | |
| sparse after each BS * BPT byte segment is read from the input, it is che
cked for being all zeros. If so, | | sparse after each BS * BPT byte segment is read from the input, it is che
cked for being all zeros. If so, |
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| skipping to change at line 470 | | skipping to change at line 470 |
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| The lmbench package contains lmdd which is also interesting. For moving d
ata to and from tapes see dt | | The lmbench package contains lmdd which is also interesting. For moving d
ata to and from tapes see dt |
| which is found at https://www.scsifaq.org/RMiller_Tools/index.html | | which is found at https://www.scsifaq.org/RMiller_Tools/index.html |
| | |
| To change mode parameters that effect a SCSI device's caching and error r
ecovery see sdparm(sdparm) | | To change mode parameters that effect a SCSI device's caching and error r
ecovery see sdparm(sdparm) |
| | |
| To verify the data on the media or to verify it against some ot
her copy of the data see sg_ver- | | To verify the data on the media or to verify it against some ot
her copy of the data see sg_ver- |
| ify(sg3_utils) | | ify(sg3_utils) |
| | |
| See also raw(8), dd(1), ddrescue(GNU), ddpt | | See also raw(8), dd(1), ddrescue(GNU), ddpt |
| | |
|
| sg3_utils-1.47 April 2021
SG_DD(8) | | sg3_utils-1.47 August 2021
SG_DD(8) |
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| End of changes. 2 change blocks. |
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| 1 lines changed or deleted | | 1 lines changed or added |
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