Performance Characteristics; Internal Drive Characteristics; Format Command Execution Time; Fast Format - Seagate EXOS ST16000NM004J Product Manual

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4.0

Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Exos X18 drives.
4.1

Internal drive characteristics

Drive capacity
Read/write data heads
Bytes/track
Bytes/surface
Tracks/surface (total)
Tracks/in
Peak bits/in
Areal density
Internal data rate
Disk rotation speed
Avg rotational latency
4.1.1

Format command execution time

5xxE-byte sectors (minutes)
Maximum (with verify)
Maximum (without verify)
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a Status Byte Transfer to the
Initiator (excluding connect/disconnect).
When changing sector sizes, the format times shown above may need to be increased by 30 minutes.
4.1.2

Fast Format

Drive sector size transition
• Single code to support sector sizes from 512E
• T10 fast format conversion between 512E configurations in the field.
• Possible only if sector sizes are exact multiples of 8 & vice versa
• The selected sector size will take effect only after fast format or full format
• Drive default is 512E from the factory.
• 512E features set after Fast Format
T10 Fast Format
• Implements the fast format based on T10 Spec.
• To request Fast Format, the FFMT bits (Byte 4, Bits 1:0) should be set to 01b.
• A setting of 10b or 11b will return a check condition with 05/24 sense code (pointing to FFMT MSB in CDB).
Mode Select - Parameter list header
• Set Write buffer: // Set Block Descriptor Length = 0x08, Number of LBAs = 0xFFFFFFFF
• 00 00 00 00 00 00 00 08 FF FF FF FF 00 00 02 00 // Set block size to 0512 (0x0200)
• Then Send Mode Select Command
• cdb: 55 01 00 00 00 00 00 00 10 00 // (SP bit = 1, Parameter list = 0x10)
Format Unit - Parameter list header
• Set Write buffer: // Set IMMED = 1
• 00 02 00 00
• Then Send Format Unit Command
• cdb: 04 14 00 00 01 00 // (FMTDAT = 1, DEFECT LIST FORMAT = 010b, FFMT = 01b)
Seagate Exos X18 SAS Product Manual, Rev. G
18TB 16TB
18 17
1,840,943 1,785,977
1,000,000 941,176
543,200 526,981
482,000 467,609
2,470,000 2,396,251
1146 1121
2899 2812
7200 7200
4.16 4.16
18TB models 16TB models
2930
1465
14TB 12TB
14 12
1,840,943 1,704,382
1,000,000 857,143
543,200 502,905
482,000 446,245
2,470,000 2,286,776
1146 1020
2899 2684
7200 7200
4.16 4.16
14TB models
2740 2263
1370 1131
Performance characteristics
(formatted, rounded off value)
10TB
10
1,680,543 Bytes (average, rounded off values)
833,333 MB (unformatted, rounded off values)
495,871 Tracks (user accessible)
440,004 TPI (average)
2,254,791 BPI
992 Gb/in2
2646 Mb/s (max)
7200 RPM
4.16 ms
12TB models 10TB models
1958
979
1777
889
12