Public bug reported:
For some reason Linux (dd/mkfs.vfat/mkfs.ext4) treats the first
partition of my sdcard as 16GB regardless of what fdisk says it should
be. dd sees the other partitions as the correct size.
Also if I run mkfs.vfat on the first partition it is treated as a fuse
filesystem when mounted, it seems very strange. The whole card has been
zeroed out so it shouldn't be an issue of some other weird data on the
card. Pulling and reinserting the card after partitioning makes no
difference. I have also included the fdisk bootsector dump at the end of
this message.
Running linux 4.4.0-38.57 amd64
---
ii linux-headers-4.4.0-38 4.4.0-38.57
all Header files related to Linux kernel version 4.4.0
ii linux-headers-4.4.0-38-generic 4.4.0-38.57
amd64 Linux kernel headers for version 4.4.0 on 64 bit x86
SMP
ii linux-image-4.4.0-38-generic 4.4.0-38.57
amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
ii linux-image-extra-4.4.0-38-generic 4.4.0-38.57
amd64 Linux kernel extra modules for version 4.4.0 on 64 bit
x86 SMP
ii linux-signed-image-4.4.0-38-generic 4.4.0-38.57
amd64 Signed kernel image generic
ii linux-tools-4.4.0-38 4.4.0-38.57
amd64 Linux kernel version specific tools for version
4.4.0-38
ii linux-tools-4.4.0-38-generic 4.4.0-38.57
amd64 Linux kernel version specific tools for version
4.4.0-38
---
# fdisk -l /dev/sdd
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
# fdisk /dev/sdd
Welcome to fdisk (util-linux 2.27.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x57ca34c2.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-62521343, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-62521343, default 62521343):
+512MiB
Created a new partition 1 of type 'Linux' and of size 512 MiB.
Command (m for help): p
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M 83 Linux
Command (m for help): n
Partition type
p primary (1 primary, 0 extended, 3 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (2-4, default 2):
First sector (1050624-62521343, default 1050624):
Last sector, +sectors or +size{K,M,G,T,P} (1050624-62521343, default 62521343):
+512MiB
Created a new partition 2 of type 'Linux' and of size 512 MiB.
Command (m for help): n
Partition type
p primary (2 primary, 0 extended, 2 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (3,4, default 3):
First sector (2099200-62521343, default 2099200):
Last sector, +sectors or +size{K,M,G,T,P} (2099200-62521343, default 62521343):
+1024MiB
Created a new partition 3 of type 'Linux' and of size 1 GiB.
Command (m for help): n
Partition type
p primary (3 primary, 0 extended, 1 free)
e extended (container for logical partitions)
Select (default e): p
Selected partition 4
First sector (4196352-62521343, default 4196352):
Last sector, +sectors or +size{K,M,G,T,P} (4196352-62521343, default 62521343):
Created a new partition 4 of type 'Linux' and of size 27.8 GiB.
Command (m for help): print
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M 83 Linux
/dev/sdd2 1050624 2099199 1048576 512M 83 Linux
/dev/sdd3 2099200 4196351 2097152 1G 83 Linux
/dev/sdd4 4196352 62521343 58324992 27.8G 83 Linux
Command (m for help): t
Partition number (1-4, default 4): 1
Partition type (type L to list all types): c
Changed type of partition 'Linux' to 'W95 FAT32 (LBA)'.
Command (m for help): print
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M c W95 FAT32 (LBA)
/dev/sdd2 1050624 2099199 1048576 512M 83 Linux
/dev/sdd3 2099200 4196351 2097152 1G 83 Linux
/dev/sdd4 4196352 62521343 58324992 27.8G 83 Linux
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
# blockdev --rereadpt /dev/sdd
# fdisk -l /dev/sdd
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M c W95 FAT32 (LBA)
/dev/sdd2 1050624 2099199 1048576 512M 83 Linux
/dev/sdd3 2099200 4196351 2097152 1G 83 Linux
/dev/sdd4 4196352 62521343 58324992 27.8G 83 Linux
# dd if=/dev/zero of=/dev/sdd1 bs=8M
dd: error writing '/dev/sdd1': No space left on device
2002+0 records in
2001+0 records out
16786972672 bytes (17 GB, 16 GiB) copied, 7.27734 s, 2.3 GB/s
# dd if=/dev/zero of=/dev/sdd2 bs=8M
dd: error writing '/dev/sdd2': No space left on device
65+0 records in
64+0 records out
536870912 bytes (537 MB, 512 MiB) copied, 6.76225 s, 79.4 MB/s
# dd if=/dev/zero of=/dev/sdd3 bs=8M
dd: error writing '/dev/sdd3': No space left on device
129+0 records in
128+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 13.7579 s, 78.0 MB/s
# dd if=/dev/zero of=/dev/sdd4 bs=8M
dd: error writing '/dev/sdd4': No space left on device
3560+0 records in
3559+0 records out
29862395904 bytes (30 GB, 28 GiB) copied, 370.45 s, 80.6 MB/s
# fdisk -l /dev/sdd
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M c W95 FAT32 (LBA)
/dev/sdd2 1050624 2099199 1048576 512M 83 Linux
/dev/sdd3 2099200 4196351 2097152 1G 83 Linux
/dev/sdd4 4196352 62521343 58324992 27.8G 83 Linux
---
Expert command (m for help): p
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Id Type Start-C/H/S
End-C/H/S Attrs
/dev/sdd1 2048 1050623 1048576 c W95 FAT32 (LBA) 1/1/0
512/32/63
/dev/sdd2 1050624 2099199 1048576 83 Linux 513/1/0
0/32/63
/dev/sdd3 2099200 4196351 2097152 83 Linux 1/1/0
0/32/63
/dev/sdd4 4196352 62521343 58324992 83 Linux 1/1/0
831/32/63
---
Expert command (m for help): d
First sector: offset = 0, size = 512 bytes.
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
*
000001b0 00 00 00 00 00 00 00 00 c2 34 ca 57 00 00 00 00
000001c0 01 01 0c 3f a0 00 00 08 00 00 00 00 10 00 00 00
000001d0 81 01 83 3f 20 00 00 08 10 00 00 00 10 00 00 00
000001e0 01 01 83 3f 20 00 00 08 20 00 00 00 20 00 00 00
000001f0 01 01 83 3f e0 3f 00 08 40 00 00 f8 79 03 55 aa
---
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
- For some reason Linux treats the first partition of my sdcard as 16GB
- regardless of what fdisk says it should be. dd sees the other partitions
- as the correct size.
+ For some reason Linux (dd/mkfs.vfat/mkfs.ext4) treats the first
+ partition of my sdcard as 16GB regardless of what fdisk says it should
+ be. dd sees the other partitions as the correct size.
Also if I run mkfs.vfat on the first partition it is treated as a fuse
filesystem when mounted, it seems very strange. The whole card has been
zeroed out so it shouldn't be an issue of some other weird data on the
card. Pulling and reinserting the card after partitioning makes no
difference. I have also included the fdisk bootsector dump at the end of
this message.
Running linux 4.4.0-38.57 amd64
---
ii linux-headers-4.4.0-38 4.4.0-38.57
all Header files related to Linux kernel version 4.4.0
ii linux-headers-4.4.0-38-generic 4.4.0-38.57
amd64 Linux kernel headers for version 4.4.0 on 64 bit x86
SMP
ii linux-image-4.4.0-38-generic 4.4.0-38.57
amd64 Linux kernel image for version 4.4.0 on 64 bit x86
SMP
ii linux-image-extra-4.4.0-38-generic 4.4.0-38.57
amd64 Linux kernel extra modules for version 4.4.0 on 64
bit x86 SMP
ii linux-signed-image-4.4.0-38-generic 4.4.0-38.57
amd64 Signed kernel image generic
ii linux-tools-4.4.0-38 4.4.0-38.57
amd64 Linux kernel version specific tools for version
4.4.0-38
ii linux-tools-4.4.0-38-generic 4.4.0-38.57
amd64 Linux kernel version specific tools for version
4.4.0-38
---
# fdisk -l /dev/sdd
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
# fdisk /dev/sdd
Welcome to fdisk (util-linux 2.27.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x57ca34c2.
Command (m for help): n
Partition type
- p primary (0 primary, 0 extended, 4 free)
- e extended (container for logical partitions)
+ p primary (0 primary, 0 extended, 4 free)
+ e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
- First sector (2048-62521343, default 2048):
+ First sector (2048-62521343, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-62521343, default 62521343):
+512MiB
Created a new partition 1 of type 'Linux' and of size 512 MiB.
Command (m for help): p
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M 83 Linux
Command (m for help): n
Partition type
- p primary (1 primary, 0 extended, 3 free)
- e extended (container for logical partitions)
+ p primary (1 primary, 0 extended, 3 free)
+ e extended (container for logical partitions)
Select (default p): p
- Partition number (2-4, default 2):
- First sector (1050624-62521343, default 1050624):
+ Partition number (2-4, default 2):
+ First sector (1050624-62521343, default 1050624):
Last sector, +sectors or +size{K,M,G,T,P} (1050624-62521343, default
62521343): +512MiB
Created a new partition 2 of type 'Linux' and of size 512 MiB.
Command (m for help): n
Partition type
- p primary (2 primary, 0 extended, 2 free)
- e extended (container for logical partitions)
+ p primary (2 primary, 0 extended, 2 free)
+ e extended (container for logical partitions)
Select (default p): p
- Partition number (3,4, default 3):
- First sector (2099200-62521343, default 2099200):
+ Partition number (3,4, default 3):
+ First sector (2099200-62521343, default 2099200):
Last sector, +sectors or +size{K,M,G,T,P} (2099200-62521343, default
62521343): +1024MiB
Created a new partition 3 of type 'Linux' and of size 1 GiB.
Command (m for help): n
Partition type
- p primary (3 primary, 0 extended, 1 free)
- e extended (container for logical partitions)
+ p primary (3 primary, 0 extended, 1 free)
+ e extended (container for logical partitions)
Select (default e): p
Selected partition 4
- First sector (4196352-62521343, default 4196352):
- Last sector, +sectors or +size{K,M,G,T,P} (4196352-62521343, default
62521343):
+ First sector (4196352-62521343, default 4196352):
+ Last sector, +sectors or +size{K,M,G,T,P} (4196352-62521343, default
62521343):
Created a new partition 4 of type 'Linux' and of size 27.8 GiB.
Command (m for help): print
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M 83 Linux
/dev/sdd2 1050624 2099199 1048576 512M 83 Linux
/dev/sdd3 2099200 4196351 2097152 1G 83 Linux
/dev/sdd4 4196352 62521343 58324992 27.8G 83 Linux
Command (m for help): t
Partition number (1-4, default 4): 1
Partition type (type L to list all types): c
Changed type of partition 'Linux' to 'W95 FAT32 (LBA)'.
Command (m for help): print
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M c W95 FAT32 (LBA)
/dev/sdd2 1050624 2099199 1048576 512M 83 Linux
/dev/sdd3 2099200 4196351 2097152 1G 83 Linux
/dev/sdd4 4196352 62521343 58324992 27.8G 83 Linux
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
# blockdev --rereadpt /dev/sdd
# fdisk -l /dev/sdd
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M c W95 FAT32 (LBA)
/dev/sdd2 1050624 2099199 1048576 512M 83 Linux
/dev/sdd3 2099200 4196351 2097152 1G 83 Linux
/dev/sdd4 4196352 62521343 58324992 27.8G 83 Linux
# dd if=/dev/zero of=/dev/sdd1 bs=8M
dd: error writing '/dev/sdd1': No space left on device
2002+0 records in
2001+0 records out
16786972672 bytes (17 GB, 16 GiB) copied, 7.27734 s, 2.3 GB/s
# dd if=/dev/zero of=/dev/sdd2 bs=8M
dd: error writing '/dev/sdd2': No space left on device
65+0 records in
64+0 records out
536870912 bytes (537 MB, 512 MiB) copied, 6.76225 s, 79.4 MB/s
# dd if=/dev/zero of=/dev/sdd3 bs=8M
dd: error writing '/dev/sdd3': No space left on device
129+0 records in
128+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 13.7579 s, 78.0 MB/s
# dd if=/dev/zero of=/dev/sdd4 bs=8M
dd: error writing '/dev/sdd4': No space left on device
3560+0 records in
3559+0 records out
29862395904 bytes (30 GB, 28 GiB) copied, 370.45 s, 80.6 MB/s
# fdisk -l /dev/sdd
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1050623 1048576 512M c W95 FAT32 (LBA)
/dev/sdd2 1050624 2099199 1048576 512M 83 Linux
/dev/sdd3 2099200 4196351 2097152 1G 83 Linux
/dev/sdd4 4196352 62521343 58324992 27.8G 83 Linux
---
Expert command (m for help): p
Disk /dev/sdd: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x57ca34c2
Device Boot Start End Sectors Id Type Start-C/H/S
End-C/H/S Attrs
- /dev/sdd1 2048 1050623 1048576 c W95 FAT32 (LBA) 1/1/0
512/32/63
- /dev/sdd2 1050624 2099199 1048576 83 Linux 513/1/0
0/32/63
- /dev/sdd3 2099200 4196351 2097152 83 Linux 1/1/0
0/32/63
- /dev/sdd4 4196352 62521343 58324992 83 Linux 1/1/0
831/32/63
+ /dev/sdd1 2048 1050623 1048576 c W95 FAT32 (LBA) 1/1/0
512/32/63
+ /dev/sdd2 1050624 2099199 1048576 83 Linux 513/1/0
0/32/63
+ /dev/sdd3 2099200 4196351 2097152 83 Linux 1/1/0
0/32/63
+ /dev/sdd4 4196352 62521343 58324992 83 Linux 1/1/0
831/32/63
---
Expert command (m for help): d
First sector: offset = 0, size = 512 bytes.
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
*
000001b0 00 00 00 00 00 00 00 00 c2 34 ca 57 00 00 00 00
000001c0 01 01 0c 3f a0 00 00 08 00 00 00 00 10 00 00 00
000001d0 81 01 83 3f 20 00 00 08 10 00 00 00 10 00 00 00
000001e0 01 01 83 3f 20 00 00 08 20 00 00 00 20 00 00 00
000001f0 01 01 83 3f e0 3f 00 08 40 00 00 f8 79 03 55 aa
---
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https://bugs.launchpad.net/bugs/1634005
Title:
linux treats first partition on sdcard as much bigger than it really
is?
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