Before transmitting a Western My Cloud Mirror 6TB NAS storage in RAID 1 (2x 3 TB) from one customer (selling it) to another one (buying it), I need to wipe the data, whilst preserving intact the system features.
In the NAS, the drives were in RAID 1. I extracted them from their enclosure and connected them in SATA using.
Listing the drives with fdisk -l
in Linux Parted Magic distro gives the output below. The volume with the data is obviously dev/md1
.
WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sda: 3000.6 GB, 3000592982016 bytes
256 heads, 63 sectors/track, 363376 cylinders, total 5860533168 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: 0x00000000
Device Boot Start End Blocks Id System
/dev/sda1 1 4294967295 2147483647+ ee GPT
Partition 1 does not start on physical sector boundary.
WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sdb: 3000.6 GB, 3000592982016 bytes
256 heads, 63 sectors/track, 363376 cylinders, total 5860533168 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: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdb1 1 4294967295 2147483647+ ee GPT
Partition 1 does not start on physical sector boundary.
Disk /dev/md0: 2147 MB, 2147418112 bytes
2 heads, 4 sectors/track, 524272 cylinders, total 4194176 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 /dev/md1: 2996.3 GB, 2996296343552 bytes
2 heads, 4 sectors/track, 731517662 cylinders, total 5852141296 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
So, my questions:
/dev/sda
and /dev/sdb
drives, will it suffice to shred dev/md1
?shred
, will I have to reformat the "volumes" making dev/md1 RAID?
I don't think so as the data area on each drive show as RAW, but I would like to be sure before wiping the drive.If the data were synced with some remote account in the cloud, I want to make sure that the buyer cannot accidentally access the seller's files there.
Thanks.
Using shred
with one pass would be enough
shred -v -n 1 /dev/sda
No need to reformat as shred
will remove all data including its format and partition tables.
You can unmount the drive partitions by umount /dev/sda1
or umount /dev/sdb1
. Also removing it from /etc/fstab
.
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