数据存储安全问题：机械硬盘存储的数据，如果意外发生了比特反转，那么操作系统读取其数据是否有检验还是直接读取错误值？
如果磁盘硬件层面存在数据错误检测机制，那么他能够恢复多少比特位的数据错误？他采用的纠错算法是什么算法？怎么看自己的磁盘是否支持此纠错算法？
应该是有校验的，xxx.xxx已经损坏或丢失， 以前电脑经常会有这种问题
硬盘最小存储单元是扇区（大小为512B到4KB不等），每个扇区分两个部分：扇区头和数据，其中扇区头含有错误检测和纠正信息（比如CRC校验），操作系统根据错误检测就知道扇区里的数据是否损坏。
参考
https://en.wikipedia.org/wiki/Disk_sector
In computer disk storage, a sector is a subdivision of a track on a magnetic disk or optical disc. Each sector stores a fixed amount of user-accessible data, traditionally 512 bytes for hard disk drives (HDDs) and 2048 bytes for CD-ROMs and DVD-ROMs. Newer HDDs use 4096-byte (4 KiB) sectors, which are known as the Advanced Format (AF).
The sector is the minimum storage unit of a hard drive.[1] Most disk partitioning schemes are designed to have files occupy an integral number of sectors regardless of the file's actual size. Files that do not fill a whole sector will have the remainder of their last sector filled with zeroes. In practice, operating systems typically operate on blocks of data, which may span multiple sectors.[2]
In modern disk drives, each physical sector is made up of two basic parts, the sector header area (typically called "ID") and the data area. The sector header contains information used by the drive and controller; this information includes sync bytes, address identification, flaw flag and error detection and correction information. The header may also include an alternate address to be used if the data area is undependable. The address identification is used to ensure that the mechanics of the drive have positioned the read/write head over the correct location. The data area contains the sync bytes, user data and an error-correcting code (ECC) that is used to check and possibly correct errors that may have been introduced into the data.