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# blkdiscard
> 丢弃存储设备上的设备扇区。对 SSD 有用。
> 更多信息:<https://manned.org/blkdiscard>.
- 丢弃设备上的所有扇区,删除所有数据:
`blkdiscard {{/dev/设备名}}`
- 安全地丢弃设备上的所有块,删除所有数据:
`blkdiscard --secure {{/dev/设备名}}`
- 丢弃设备的前 100 MB:
`blkdiscard --length {{100MB}} {{/dev/设备名}}`