12.14 48-Bit Address Feature Set - Hitachi HTS541616J9AT00 - Travelstar 160 GB Hard Drive Specifications

2.5 inch ata/ide hard disk drive
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12.14 48-bit Address Feature Set

The 48-bit Address feature set allows devices with capacities up to 281,474,976,710,655 sectors. This allows device
capacity up to 144,115,188,075,855,360 bytes. In addition, the number of sectors that may be transferred by a single
command are increased by increasing the allowable sector count to 16 bits.
Commands unique to the 48-bit Address feature set are:
Flush Cache Ext
Read DMA Ext
Read Multiple Ext
Read Native Max Address Ext
Read Sector(s) Ext
Read Verify Sector(s) Ext
Set Max Address Ext
Write DMA Ext
Write DMA FUA Ext
Write Multiple Ext
Write Multiple FUA Ext
Write Sector(s) Ext
The 48-bit Address feature set operates in LBA addressing only. Devices also implement commands using 28-bit
addressing, and 28-bit and 48-bit commands may be intermixed.
In a device, the Features, the Sector Count, the LBA Low/Mid/High registers are a two-byte-deep FIFO. Each time
one of these registers is written, the new content written is placed into the "most recently written" location and the
previous content is moved to "previous content" location.
The host may read the "previous content" of the Features, the Sector Count, the LBA Low/Mid/High registers by
first setting the High Order Bit (HOB, bit 7) of the Device control register to one and then reading the desired
register. If HOB in the Device Control register is cleared to zero, the host reads the "most recently written" content
when the register is read. A write to any Command Block register shall cause the device to clear the HOB bit to zero
in the Device Control register. The "most recently written" content always gets written by a register write regardless
of the state of HOB in the Device Control register.
Support of the 48-bit Address feature set is indicated in the Identify Device response bit 10 word 83. In addition, the
maximum user LBA address accessible by 48-bit addressable commands is contained in Identify Device response
words 100 through 103.
When the 48-bit Address feature set is implemented, the native maximum address is the value returned by a Read
Native Max Address Ext command. If the native maximum address is equal to or less than 268,435,455, a Read
Native Max Address shall return the native maximum address. If the native maximum address is greater than
268,435,455, a Read Native Max Address shall return a value of 268,435,455.
Travelstar 5K160 (PATA) Hard Disk Drive Specification
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