SCSI-1定义了一种具有5MHz数据时钟的8-bit并行接口，能提供最高 5 兆字节每秒（5MB/s）的数据传输速率。
SCSI-1 defined an 8-bit parallel interface with a 5MHz data clock, providing a maximum data transfer rate of 5 megabytes per second (MB/s).
LVARCHAR (IDS)存储可变长度的单字节或多字节文本字符串(最高可达32,739个字节)。
LVARCHAR (IDS) Stores single-byte or multibyte text strings of varying length (up to 32,739 bytes).
图像字节内的位填充次序：最高位首先填充还是最低位首先填充。
Fill order of the bit within the image bytes: most significant or least significant bit first.
big -endian意味着最高位字节存储在最低地址(按高位优先的顺序存储字)。
Big-endian means that the most significant byte has the lowest address (the word is stored big-end-first).
这个操作会得到一个整数，它有效的最高3个字节都将填入零。
This operation will result in an integer whose most significant 3 bytes will be zeroed out.
CHAR存储固定长度的单字节或多字节的文本字符串(最高可达32,767个字节)；在整理文本数据时支持使用代码集顺序。
CHAR Stores single-byte or multibyte text strings of fixed length (up to 32,767 bytes); supports code-set order in collation of text data.
VARCHAR存储可变长度的单字节或多字节文本字符串(最高可达255个字节)；在整理文本数据时支持使用代码集顺序。
VARCHAR Stores single-byte or multibyte text strings of varying length (up to 255 bytes); supports code-set order collation of text data.
read函数返回读取的字节数（最高为您指定的最大值）；或者 -1，表示错误；或者0，如果已经到达文件末尾。
The read function returns the number of bytes read (up to the maximum that you specify), -1 on error, or zero if the end of the file has been reached.
每个值都等于相应元数据标记中的最高位字节的值。
Each value is equal to the value of the top byte in the corresponding metadata token.
每个值都等于相应元数据标记中的最高位字节的值。
Each value is equal to the value of the top byte in the corresponding metadata token.
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