/*
## -----> blkid
Disk /dev/sdb: 2.7 TiB, 3000592982016 bytes, 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
Disklabel type: gpt
Disk identifier: FE6E6472-CEE4-431B-91EA-9E89C2DAC57C

Device     Start        End    Sectors  Size Type
/dev/sdb1   2048 5860533134 5860531087  2.7T Linux filesystem

## ----> fsck
e2fsck 1.43.5 (04-Aug-2017)
Osiris: recovering journal
Setting free inodes count to 183148532 (was 183148533)
Osiris: clean, 12/183148544 files, 11546855/732566385 blocks
### to je pozustatek po predchozim pouziti wget kdy se stahovani zaseklo na 17%
*/

## disk lze po cistem bootu (+fsck) pripojit.
## pokus o zapsani souboru konci nezdarem a i/o error hlaskou
## nasledne system dela ze mount je 'read only' a uz nelze ani mazat
## ... pripadne rovnou dela ze /dev/sdb1 nexistuje do dalsiho rebootu
## ... pak zas normalne dela ze je vse v poradku (fdisk,fsck,blkid hlasej vse okej...
## ... pripojim , zas jakoze okej, zkusmo wgetem stahnu iso Debianu a pic zasek a
## ... a muzu to zas zkusit jinak (coz nevim co s tim)

## -------> kernel log
[ 2074.349159] sd 1:0:0:0: [sdb] tag#26 UNKNOWN(0x2003) Result: hostbyte=0x04 driverbyte=0x00
[ 2074.349170] sd 1:0:0:0: [sdb] tag#26 CDB: opcode=0x1b 1b 00 00 00 00 00

## -------> system log
2017-12-29T23:24:20+01:00 err kernel[]: [  701.784929] Buffer I/O error on dev sdb1, logical block 1019, lost async page write
2017-12-29T23:24:20+01:00 err kernel[]: [  701.792617] Buffer I/O error on dev sdb1, logical block 1020, lost async page write
2017-12-29T23:24:20+01:00 err kernel[]: [  701.800300] Buffer I/O error on dev sdb1, logical block 1021, lost async page write
2017-12-29T23:24:20+01:00 err kernel[]: [  701.807980] Buffer I/O error on dev sdb1, logical block 1022, lost async page write
2017-12-29T23:24:20+01:00 err kernel[]: [  701.831022] Buffer I/O error on dev sdb1, logical block 1025, lost async page write
2017-12-29T23:24:20+01:00 info kernel[]: [  701.851198] sd 1:0:0:0: [sdb] tag#4 UNKNOWN(0x2003) Result: hostbyte=0x04 driverbyte=0x00
2017-12-29T23:24:20+01:00 info kernel[]: [  701.851204] sd 1:0:0:0: [sdb] tag#4 CDB: opcode=0x8a 8a 00 00 00 00 00 ae a4 18 10 00 00 00 08 00 00
2017-12-29T23:24:20+01:00 err kernel[]: [  701.851209] blk_update_request: I/O error, dev sdb, sector 2929989648

2017-12-29T23:30:38+01:00 err kernel[]: [ 1080.416134] Buffer I/O error on dev sdb, logical block 0, async page read

2017-12-29T23:36:22+01:00 info kernel[]: [ 1423.952071] sd 1:0:0:0: [sdb] tag#24 UNKNOWN(0x2003) Result: hostbyte=0x04 driverbyte=0x00
2017-12-29T23:36:22+01:00 info kernel[]: [ 1423.952086] sd 1:0:0:0: [sdb] tag#24 CDB: opcode=0x88 88 00 00 00 00 01 5d 50 a3 02 00 00 00 06 00 00
2017-12-29T23:36:22+01:00 err kernel[]: [ 1423.952098] blk_update_request: I/O error, dev sdb, sector 5860532994
2017-12-29T23:36:22+01:00 err kernel[]: [ 1423.958564] Buffer I/O error on dev sdb1, logical block 5860530946, async page read
2017-12-29T23:36:22+01:00 err kernel[]: [ 1423.966249] Buffer I/O error on dev sdb1, logical block 5860530947, async page read
2017-12-29T23:36:22+01:00 err kernel[]: [ 1423.973927] Buffer I/O error on dev sdb1, logical block 5860530948, async page read
2017-12-29T23:36:22+01:00 err kernel[]: [ 1423.981600] Buffer I/O error on dev sdb1, logical block 5860530949, async page read
2017-12-29T23:36:22+01:00 err kernel[]: [ 1423.989277] Buffer I/O error on dev sdb1, logical block 5860530950, async page read
2017-12-29T23:36:22+01:00 err kernel[]: [ 1423.996956] Buffer I/O error on dev sdb1, logical block 5860530951, async page read

## celkem dulezita poznamka na openwrt wiki:
 >> Currently there are no tools in the default OPKG repository to create and partition GPT based devices. The Linux tools  parted and gdisk have not yet been included. Note that while it cannot create GPT tables, there is full support for GPT disks in the OpenWrt kernel, so prepartitioned drives with GPT will work. Also note that if you want to erase a GPT partition table and clear the device to start over with a MBR partition table you have to delete the backup copies of the table that GPT defines, usually also at the end of the device. Since there is no true GPT tool for this in the repository yet, you can erase the tables with the dd tool. This is a parted makefile for OpenWrt that someone provides. After adding dependencies for libblkid and libuuid the package builds fine. Maybe someone should send a patch to the devel-mailinglist.