# 불량 섹터

1. ssh 접속
2. sudo -i

<code>
$ fdisk -l

Disk /dev/sdb: 4.6 TiB, 5000981078016 bytes, 9767541168 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: 44F3A03E-44F3-44F3-BEFA-44F338B944F3
</code>


<code>
$ badblocks -svnf /dev/sdb

/dev/sdb is apparently in use by the system; badblocks forced anyway.
Checking for bad blocks in non-destructive read-write mode
From block 0 to 588803287
Checking for bad blocks (non-destructive read-write test)
Testing with random pattern:   0.31% done, 2:57 elapsed. (0/0/0 errors)
</code>


- https://github.com/Entware/Entware-ng/wiki/Install-on-Synology-NAS

<code>
uname -a
</code>

<code>
wget -O - http://pkg.entware.net/binaries/armv7/installer/entware_install.sh | /bin/sh
</code>

<code>
 export PATH="/opt/bin:/opt/sbin:$PATH"
</code>

<code>
opkg update
opkg install screen
</code>

## links

- https://siane.tistory.com/278
- https://www.reddit.com/r/synology/comments/5p7wvf/how_can_i_install_gnu_screen_on_my_ds413/