Quantum FIREBALL PLUS AS 10.2 User Manual

ATA Bus Interface and ATA Commands
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT 6-79
RC – Read Continuous (Byte 36, Bit 4): When set to 1, this bit instructs the drive
to transfer data of the requested length without adding delays to increase data
integrity—that is, delays caused by the drive’s error-recovery procedures. With RC
set to 1 to maintain a continuous flow of data and avoid delays, the drive may send
data that is erroneous. When the drive ignores an error, it does not post the error.
The RC bit set to 0 indicates that potentially time-consuming operations for error
recovery are acceptable during data transfer. The default setting is 0.
EEC – Enable Early Correction (Byte 36, Bit 3): When set to 1, this bit indicates
that the drive will use its ECC algorithm if it detects two consecutive equal, nonzero
error syndromes. The drive will not perform rereads before applying correction,
unless it determines that the error is uncorrectable. An EEC bit set to 0 indicates
that the drive will use its normal recovery procedure when an error occurs: rereads,
followed by error correction. If the RC bit (byte 36, bit 4) is set to 1, the drive
ignores the EEC bit. The default setting is 0.
SilentMode (Byte 36, Bit 2): When set to 1, this bit indicates that the drive’s
acoustic emanations will be reduced.
DCR – Disable Correction (Byte 36, Bit 0): When set to 1, this bit indicates that
all data will be transferred without correction, even if it would be possible to correct
the data. A DCR bit set to 0 indicates that the data will be corrected if possible. If
the data is uncorrectable, it will be transferred without correction, though the drive
will attempt rereads. If RC (byte 36, bit 4) is set to 1, the drive ignores this bit. The
default setting is 0. The drive will post all errors, whether DCR is set to 0 or 1.
NUMBER OF RETRIES (Byte 37): This byte specifies the number of times that
the drive will attempt to recover from data errors by rereading the data, before it will
apply correction. The drive performs rereads before ECC correction—unless EEC
(byte 36, bit 3) is set to 1, enabling early correction. The default is eight.
ECC CORRECTION SPAN (Byte 38): This byte specifies the maximum number
of 10-bit symbols that can be corrected using ECC. The default value for this byte is
20h or 32 decimal.
6.7.28.8
6.7.28.86.7.28.8
6.7.28.8 Drive Parameters
Drive ParametersDrive Parameters
Drive Parameters
WCE – Write Cache Enable (Byte 39, Bit 2): When this bit is set to1, the Quantum
Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT hard disk drives enable the Write
Cache. This indicates that the drive returns GOOD status for a write command after
successfully receiving the data, but before writing it to the disk. A value of zero
indicates that the drive returns GOOD status for a write command after
successfully receiving the data and writing it to the disk.
If the next command is another WRITE command, cached data continues to be
written to the disk while new data is added to the buffer. The default setting is 1.
RUEE – Reallocate Uncorrectable Error Enables (Byte 39, Bit 1): When set to 1,
this bit indicates that the Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB
AT hard disk drives will automatically reallocate uncorrectable hard errors, if the
ARR bit (byte 36, bit 6) is set to 1. The default setting is 1.
6.7.29
6.7.296.7.29
6.7.29 Host Protected Mode Feature
Host Protected Mode FeatureHost Protected Mode Feature
Host Protected Mode Feature
These commands allow for a data storage area outside the normal operating system
file area. Systems can use this area to store configuration data or save memory to
the device in a location that the operating system cannot change.

Quantum FIREBALL PLUS AS 10.2 Specifications

General

Brand	Quantum
Model	FIREBALL PLUS AS 10.2
Category	Storage
Language	English