The fundamental format of the filesystem is based on a single B+ tree, which makes search operations efficient and very scalable.
该文件系统的基础格式建立在单一的 B+ 树的基础之上，这使得搜索的效率和可伸缩性增强。
2
The former method USES a singlefile to hold all of the E-mail, occasionally changing this to a system where a singlefile holds the mail for each folder.