使用“ dd”将文件复制到整个设备（2TB硬盘）后，我可以在其中“ dd”个更多的文件而不会丢失原始文件吗？

仅使用外部硬盘-不使用内部硬盘...

我有一个容量为0.25％的2TB硬盘；我使用以下命令将“ dd”文件添加到该文件：

"sudo dd if=/dev/sda bs=16M of=/dev/sdb"

(sda and sdb = 2 different hdd's)

I would like to 'dd' more files there from another hdd, to fill up the rest of the 2TB hdd. I do **NOT** want to add the files to the 2TB hdd as an image. 

**UPDATE:** 
sudo fdisk -l /dev/sda
Disk /dev/sda: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model:                 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 4096 bytes / 33553920 bytes
Disklabel type: gpt
Disk identifier: xxxxx

Device      Start       End   Sectors   Size Type
/dev/sda2  264192 976771071 976506880 465.7G Microsoft basic data

:~$ sudo gdisk -l /dev/sda
GPT fdisk (gdisk) version 1.0.3

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 3907029168 sectors, 1.8 TiB
Model:                 
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 3907029134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2930522221 sectors (1.4 TiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   2          264192       976771071   465.6 GiB   0700  Basic data partition