Hi,
attached patch seems to fix the problem for me. I'd appreciate any
feedback.

Thanks!

---
 libparted/labels/dos.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/libparted/labels/dos.c b/libparted/labels/dos.c
index cb7e45e..a300a87 100644
--- a/libparted/labels/dos.c
+++ b/libparted/labels/dos.c
@@ -1059,7 +1059,8 @@ write_ext_table (const PedDisk* disk,
 
        lba_offset = ped_disk_extended_partition (disk)->geom.start;
 
-       memset (&table, 0, sizeof (DosRawTable));
+       ped_device_read (disk->dev, &table, sector, 1);
+       memset (&(table.partitions), 0, 4 * sizeof(DosRawPartition));
        table.magic = PED_CPU_TO_LE16 (MSDOS_MAGIC);
 
        if (!fill_raw_part (&table.partitions[0], logical, sector))
@@ -1093,7 +1094,8 @@ write_empty_table (const PedDisk* disk, PedSector sector)
 
        PED_ASSERT (disk != NULL, return 0);
 
-       memset (&table, 0, sizeof (DosRawTable));
+       ped_device_read (disk->dev, &table, sector, 1);
+       memset (&(table.partitions), 0, 4 * sizeof(DosRawPartition));
        table.magic = PED_CPU_TO_LE16 (MSDOS_MAGIC);
 
        return ped_device_write (disk->dev, (void*) &table, sector, 1);
-- 
1.6.0.2


-- 
Best regards / s pozdravem

Petr Uzel, Packages maintainer
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