LOG SENSE
7. ATAPI Packet Command Specification
SONY AIT-1Turbo drive SDX-460V series Ver.1.0
7-23
Kilobytes to/from Data Compression:
The total number of kilobytes written to or read from the tape since the
last power-on or Clear Log operation. For Kilobytes from Data Compression, this number may be greater than the
number of kilobytes transferred to the host due to read ahead.
Logical Entity Size:
The logical size of the last entity written to or read from the tape: size = number of record in
entity x record size in bytes.
Physical Entity Size:
The physical size of the last entity written to or read from the tape: size = entity header
uncompressed data length.
Uncompressed Entities:
The total number of times non-ALDC entities have been encountered on the tape during
read operations since the last power-on or Clear Log operation.
7.6.11.
AIT Log Page Code 3Ch
This page is for the AIT original Tape Log. The AIT Tape Log of each field is larger than the legacy Tape Log Page.
The legacy Tape Log Page returns the part of AIT original. This page has the following format.
Table 7-29: LOG PAGE AIT (3Ch)
Bit
Byte
7 6 5 4 3 2 1 0
0
Reserved
Page Code (3Ch)
1
Reserved
2
(MSB)
3
Page Length (n+1)
(LSB)
4
(MSB)
5
Parameter Code (0001h – 0012h and 0101h – 0112h)
(LSB)
6
0 (DU)
1 (DS)
0 (TSD)
0 (ETC)
00 (TMC)
Reserved
0 (LP)
7
Parameter Length (n-7)
8
n
Parameter Value
Supported Parameter Code in this page are listed below with their meaning:
Parameter Code
Description
Length (bytes)
0001h
Current Number of Groups Written
4
0002h
Current RAW Retries
4
0003h
Current Number of Groups Read
4
0004h
Current C3 ECC Retries
4
0005h
Previous Number of Groups Written
4
0006h
Previous RAW Retries
4
0007h
Previous Number of Group Reads
4
0008h
Previous C3 ECC Retries
4
0009h
Total Number of Groups Written
4
000Ah
Total RAW Retries
4
000Bh
Total Number of Groups Read
4
000Ch
Total C3 ECC Retries
4
000Dh Load
Count
4
000Eh Access
Count
4
000Fh
Update Replace Count
4
0010h
Last Valid Absolute Frame Number
4
0011h Partition
Attribute
4
0012h
Maximum Absolute Frame Number
4