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jserink
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Joined: 30 Jan 2004
Posts: 1019
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 Posted: Thu Nov 24, 2011 8:31 am Post subject: USB3.0 Ext HDD[SOLVED] |
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Hi All:
I just got myself a Seagate 2T USB 3 drive for backups on my new laptop. Unfortunately, my Dell M4600 is finniky on boot and will not run clonezilla x64 at all so I wanted to just do a "dd" backup from the gentoo x64 live USB that I have, but I got confused when I plugged in my USB3 drive. I booted back into Linux on the machine and plugged the drive in, here is what I get:
jserinki7 linux # fdisk -l
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xebe440c1
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Device Boot Start End Blocks Id System
/dev/sdb1 63 3907024127 1953512032+ 7 HPFS/NTFS/exFAT
Now hang on a minute, I redid the external drive as ext4. This is what the gentoo live USB showed as well.
Now look at this:
jserinki7 linux # fdisk /dev/sdb1
Command (m for help): p
Disk /dev/sdb1: 2000.4 GB, 2000396321280 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907024065 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x5c9ea4e5
Device Boot Start End Blocks Id System
/dev/sdb1p1 * 2048 3907024064 1953511008+ 83 Linux
Command (m for help):
WTF????
When I do fdisk -l it shows an NTFS/HPFS drive starting on block 63, when I go into fdisk it shows a Linux drive starting at block 2048.
Am I going mad here? Does anyone know what is going on?
Does this have something to so with the new 4096 cluster sizes for new disks?
cheers,
John
Last edited by jserink on Thu Dec 15, 2011 6:19 am; edited 1 time in total |
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Aquous
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Joined: 08 Jan 2011
Posts: 700
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| Posted: Thu Nov 24, 2011 8:43 am Post subject: Re: USB3.0 Ext HDD |
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| jserink wrote: | Now look at this:
jserinki7 linux # fdisk /dev/sdb1 |
There's your problem. /dev/sdb1 is a partition and by telling fdisk to look at it you're telling it to look for partitions inside that partition. For some strange reason, it actually finds one! (it lists a /dev/sdb1p1)
You most likely typoed somewhere when making your partitions. The fix:
1) delete all partitions and repartition your drive using fdisk /dev/sdb. This will only update the MBR of your drive.
2) it's pretty messed up to find a partition inside a partition and that nested partition's metadata probably overwrote some critical filesystem structures. So rebuild the filesystem using e.g.
| Code: | | mkfs.ext4 /dev/sdb1 |
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jserink
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Joined: 30 Jan 2004
Posts: 1019
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| Posted: Thu Nov 24, 2011 9:36 am Post subject: |
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Hi Aquos:
you were absolutely correct.
I wiped everything, redid it and now it says this:
jserinki7 linux # fdisk -l
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Disk /dev/sdb: 2000.4 GB, 2000398933504 bytes
81 heads, 62 sectors/track, 777982 cylinders, total 3907029167 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x51f4cf7e
Device Boot Start End Blocks Id System
/dev/sdb1 2048 3907029166 1953513559+ 83 Linux
jserinki7 linux # fdisk /dev/sdb
Command (m for help): p
Disk /dev/sdb: 2000.4 GB, 2000398933504 bytes
81 heads, 62 sectors/track, 777982 cylinders, total 3907029167 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x51f4cf7e
Device Boot Start End Blocks Id System
/dev/sdb1 2048 3907029166 1953513559+ 83 Linux
Ok, I'm good.
Cheers,
John |
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