On 03/14/2016 10:23 AM, jd1008 wrote:
On 03/14/2016 11:17 AM, Rick Stevens wrote:
On 03/14/2016 10:11 AM, jd1008 wrote:
Hi all,
time dd if=/dev/sr0 of=Our_Group_Picnic.iso bs=64M skip=5888
conv=noerror,notrunc oflag=append
dd: ‘/dev/sr0’: cannot skip: Invalid argument
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000301689 s, 0.0 kB/s
but
{3464-jd@localhost}$ time dd if=/dev/sr0 of=Our_Group_Picnic.iso bs=64M
conv=noerror,notrunc
works just fine.
So why is it that skip des not work on optical media?
Skip works fine, but you must specify the units. "skip=5888" doesn't
tell dd how far to skip. E.g. "skip=5888c" would skip 5888 bytes. From
the man page:
N and BYTES may be followed by the following multiplicative
suffixes: c=1, w=2, b=512, kB =1000, K=1024, MB=1000*1000,
M=1024*1024, xM=M GB=1000*1000*1000, G=1024*1024*1024, and
so on for T, P, E, Z, Y.
I thought that bs=64M applies to all io for input and output, and skip.
I did not specify ibs= nor obs=, just bs=
I've rarely used "ibs" and "obs" separately, just "bs". That being said,
I've always used the suffix with "skip".
It may be that "bs" does not set "ibs", so a "skip=5888" wouldn't have
the size. Don't know that for a fact, but it's possible. Stranger things
have been known to happen.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx -
- AIM/Skype: therps2 ICQ: 226437340 Yahoo: origrps2 -
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- A squeegee, by any other name, wouldn't sound as funny. -
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