1. swapfile
    
   166 lsblk
   167 sudo dd if=/dev/zero of=/swapfile bsize=1M count=1000
   168 man dd
   169 sudo dd if=/dev/zero of=/swapfile bs=1M count=1000
   170 ls /
   171 sudo mkswap /swapfile
   172 sudo swapon /swapfile
   173 sudo chmod 600 /swapfile
   174 sudo swapon /swapfile
   175 swapon -s
    
2. entire copy of disk b to disk c
    
   176 fdisk /dev/sdb
   177 sudo fdisk /dev/sdb
   178 lsblk
   179 sudo mkfs.btrfs /dev/sdb1
   180 sudo mkfs.xfs /dev/sdb6
   181 sudo mkfs.ext4 /dev/sdb5
   182 lsblk -f
   183 sudo mkdir /devsdb1
   184 sudo mkdir /devsdb5
   185 sudo mkdir /devsdb6
   186 sudo mount /dev/sdb1 /devsdb1
   187 sudo mount /dev/sdb5 /devsdb5
   188 sudo mount /dev/sdb6 /devsdb6
   189 sudo touch /devsdb6/slash-volgens-marvy
   190 sudo touch /devsdb5/noel-gaapt
   191 sudo touch /devsdb1/sam-kijkt-bedenkelijk
   192 sudo init 6
   193 lsblk
   194 df
   195 dd if=/dev/sdb of=/dev/sdc bs=1M
   196 sudo dd if=/dev/sdb of=/dev/sdc bs=1M
   197 lsblk
   198 lsblk -f
   199 sudo mount /dev/sdc5 /devsdb5
   200 sudo mount /dev/sdc6 /devsdb6
   201 sudo mount /dev/sdc1 /devsdb1
   202 ls /devsdb1
   203 ls /devsdb5
   204 ls /devsdb6
    
3. safeguarding a bootsector
    
   205 dd if=/dev/sdc of=bootsector bs=1M count=1
   206 sudo dd if=/dev/sdc of=bootsector bs=1M count=1
   220 sudo dd if=/dev/zero of=/dev/sdc bs=1M count=1
   221 sudo hexedit /dev/sdc
   222 sudo dd if=/dev/random of=/dev/sdc bs=1M count=1
   223 lsblk
   224 sudo dd of=/dev/sdc if=bootsector bs=1M count=1
   225 lsblk
   226 dd if=/dev/random of=/dev/pts/1 bs=1 count=1M
   227 history
    
4. copy ssd to ssd
    
   terminal 1: $ sudo dd if=/dev/sdb of=/dev/sda bs=1G
   terminal 2: $ watch -n600 sudo kill -USR1 $(pgrep ^dd$)
    
   Every 600.0s: **sudo kill -USR1 $(pgrep ^dd$)**
    
   na 15 min: (202 GB, 188 GiB) copied, 875.616 s, 231 MB/s
   na 90 min: (912 GB, 849 GiB) copied, 5181.38 s, 176 MB/s
   na 100 min: (1.0 TB, 941 GiB) copied, 5778.7 s, 175 MB/s
   enzoverder: (1.1 TB, 1.0 TiB) copied, 6382.23 s, 174 MB/s
    
   400 min voor 4TB --> nog 5 uur >> klaar om 23h45
    
   Begonnen om 17uur
    
   1 Gbyte elke 6 seconden = 166 MByte per seconde >> 1.5 Gbit/s
   10 Gbyte per minuut
   100 Gbyte elke 10 minuten
   600 Gbyte per uur
   2400 GByte per 4 uur
   4 TeraByte per 6u40min