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After you create a new partition, always verify it:
Once that confirms the new partition, you must tell the kernel to re-read the partition table. Several ways to do this, depending on what your storage connection is. This often works:
# fdisk -l /path/to/disk
Then check if the kernel sees the partition:
# partprobe /path/to/mydisk
If it does, you are done.
# grep /proc/partitions mydisk
What are the disks, SCSI or SATA? You may have a hardware conflict or defect, such as an incorrectly terminated SCSI bus or SCSI ID conflict. If the devices are USB, you need to configure the UUID of the device using the UDEV subsystem, otherwise device names may vary between system restarts or order of plugin.