The only way to guarantee that the public key signature is from the owner is for the owner to hand you the key on a disk, in person.
保证公共密钥签名来自所有者的惟一方法是，密钥的所有者亲自把磁盘上的密钥交给您。
2
The keyto this optimization is that by delaying the allocation of physical blocks until they need to be written to the disk, more blocks are present to allocate and write in contiguous blocks.
这种优化的关键是延迟物理块的分配，直到需要在磁盘上写这些物理块时才对其进行分配并写到相邻的块。
3
A key part of this process is to map the requirements of the application model (operating system, architecture, disk, memory) to parts provided by plug-ins.