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On Sunday 15 May 2011 18:52:21 Mick wrote: |
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> On Sunday 15 May 2011 08:45:05 Adam Carter wrote: |
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> > I'm cloning a windows disk using gentoo; |
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> > |
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> > On the old 66GB disk; |
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> > # dd if=/dev/sdb of=/root/winmbr.bin bs=512 count=1 |
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> > # dd if=/dev/sdb1 bs=10M | gzip -v > winpartition.gz |
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> > |
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> > Then after swapping in the new 500GB disk; |
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> > dd if=/root/winmbr.bin of=/dev/sdb bs=512 count=1 |
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> > # gunzip -c winpartition.gz | dd of=/dev/sdb1 bs=10M |
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> > dd: writing `/dev/sdb1': No space left on device |
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> > 0+306 records in |
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> > 0+305 records out |
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> > 10137600 bytes (10 MB) copied, 0.109885 s, 92.3 MB/s |
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> > # fdisk -l /dev/sdb |
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> > |
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> > Disk /dev/sdb: 500.1 GB, 500107862016 bytes |
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> > 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors |
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> > Units = sectors of 1 * 512 = 512 bytes |
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> > Sector size (logical/physical): 512 bytes / 512 bytes |
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> > I/O size (minimum/optimal): 512 bytes / 512 bytes |
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> > Disk identifier: 0xe3f7e3f7 |
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> > |
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> > Device Boot Start End Blocks Id System |
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> > |
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> > /dev/sdb1 * 206848 117207039 58500096 7 HPFS/NTFS/exFAT |
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> > |
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> > Why is dd saying no space left after copying 10MB when sdb1 is 65GB? |
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> |
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> Not sure if the bs=10M is too large? |
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> |
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> You can try finding the optimum size of the bs= value by creating a |
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> partition on the new disk, formating it and then run something like: |
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> |
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> dd if=/dev/zero bs=1024 count=1000000 of=/1G_test.file |
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> dd if=/dev/zero bs=2048 count=500000 of=/1G_test.file |
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> dd if=/dev/zero bs=4096 count=250000 of=/1G_test.file |
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> dd if=/dev/zero bs=8192 count=125000 of=/1G_test.file |
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> |
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> and compare the results that dd reports. bs=4096 often gives best |
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> performance (on my drives at least) but with the new 1T+ drives you may |
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> find that another block size does the job better. |
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> |
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> Then zero the drive first using dd: |
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> |
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> dd if=/dev/zero of=/dev/sdb bs=4096 oflag=direct conv=notrunc |
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> |
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> and try repeating your restoring from back up with a more suitable block |
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> size. |
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|
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a) sector sizes are mentioned in the docu |
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b) compeletly unrelated. |
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