我已经安装了 SCSI DDS4 磁带驱动器并且已阅读：
https://www.freebsd.org/doc/el_GR.ISO8859-7/books/handbook/backups-tapebackups.html
和
https://docs.freebsd.org/doc/2.1.5-RELEASE/usr/share/doc/handbook/handbook127.html
我已经成功地用 tar 存储了三个目录以进行磁带保存并稍后检索它们。
如何读取磁带中存储的文件数量？
编辑>
% mt -f /dev/nsa0 eom
% mt -f /dev/nsa0 status
Drive: sa0: <SEAGATE DAT 9SP40-000 912L> Serial Number: HN0948V
---------------------------------
Mode Density Blocksize bpi Compression
Current: 0x24:DDS-2 variable 61000 enabled (DCLZ)
---------------------------------
Current Driver State: at rest.
---------------------------------
Partition: 0 Calc File Number: 4 Calc Record Number: -1
Residual: 0 Reported File Number: 4 Reported Record Number: 1266
Flags: None
%
我认为它有效