If booting from disk had been unsuccessful, for whatever reason, I would have instigated Plan b.
如果由于某种原因从磁盘引导不成功，我就采用备用计划。
2
The rows representing account A and account B are not likely to be stored in the same disk block, which means that more than one disk IO will be required to complete the transfer.
表示账户 A 和账户 B 的行可能不会存储在同一个磁盘块中，这意味着要完成转账需要进行多个磁盘 IO。