Thanks to all of you who have tried to help.
Unfortunately, I am still lost.
I just want to run Gentoo on my system, and the new drive is just for
backup, i.e. it needn't be bootable.
I have zeroed the first 8 MB and then I used gdisk
gdisk still notes that there is a backup GPT. I opted to created a new
blank GPT.
Then I created 4 partitions.
I have used the w(rite) command before exiting gdisk.
Starting gdisk again, it shows the 4 partitions.
But, after a 'sync' command I detached and re-attached the drive and I
get partially strange
output from dmesg :
[ 2225.690410] usb 9-1: New USB device found, idVendor=0bc2,
idProduct=ab34
[ 2225.690418] usb 9-1: New USB device strings: Mfr=2, Product=3,
SerialNumber=1
[ 2225.690423] usb 9-1: Product: Backup+ Desk
[ 2225.690426] usb 9-1: Manufacturer: Seagate
[ 2225.690430] usb 9-1: SerialNumber: NA7EV58E
[ 2225.692007] usb-storage 9-1:1.0: USB Mass Storage device detected
[ 2225.692167] scsi host8: usb-storage 9-1:1.0
[ 2226.693728] scsi 8:0:0:0: Direct-Access Seagate Backup+
Desk 040B PQ: 0 ANSI: 6
[ 2226.694322] sd 8:0:0:0: Attached scsi generic sg5 type 0
[ 2226.696829] sd 8:0:0:0: [sde] Spinning up disk...
16 # dmesg | tail
[ 2240.741282] sd 8:0:0:0: [sde] Very big device. Trying to use READ
CAPACITY(16).
[ 2240.741400] sd 8:0:0:0: [sde] 9767541167 512-byte logical blocks:
(5.00 TB/4.55 TiB)
[ 2240.741405] sd 8:0:0:0: [sde] 2048-byte physical blocks
[ 2240.791085] sd 8:0:0:0: [sde] Write Protect is off
[ 2240.791096] sd 8:0:0:0: [sde] Mode Sense: 4f 00 00 00
[ 2240.791853] sd 8:0:0:0: [sde] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 2240.792897] sd 8:0:0:0: [sde] Very big device. Trying to use READ
CAPACITY(16).
[ 2240.832400] sde: sde1
[ 2240.832943] sd 8:0:0:0: [sde] Very big device. Trying to use READ
CAPACITY(16).
[ 2240.835581] sd 8:0:0:0: [sde] Attached SCSI disk
17 # dmesg | tail
[ 2240.741282] sd 8:0:0:0: [sde] Very big device. Trying to use READ
CAPACITY(16).
[ 2240.741400] sd 8:0:0:0: [sde] 9767541167 512-byte logical blocks:
(5.00 TB/4.55 TiB)
[ 2240.741405] sd 8:0:0:0: [sde] 2048-byte physical blocks
[ 2240.791085] sd 8:0:0:0: [sde] Write Protect is off
[ 2240.791096] sd 8:0:0:0: [sde] Mode Sense: 4f 00 00 00
[ 2240.791853] sd 8:0:0:0: [sde] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 2240.792897] sd 8:0:0:0: [sde] Very big device. Trying to use READ
CAPACITY(16).
[ 2240.832400] sde: sde1
[ 2240.832943] sd 8:0:0:0: [sde] Very big device. Trying to use READ
CAPACITY(16).
[ 2240.835581] sd 8:0:0:0: [sde] Attached SCSI disk
and only /dev/sde and /dev/sde1 are visible.
Where are the other partitions - or am I missing a kernel option.
That is my first drive bigger than 3 TB.
Many thanks for your help,
Helmut
