RoHS Compliant
Serial ATA Flash Drive
Specifications for SAFD 255
Apr 14, 2011
Version 1.2
Apacer Technology Inc.
4 Fl., 75 Xintai 5 Rd., Sec.1, Hsichih, New Taipei City, Taiwan 221
Tel: +886-2-2698-2888
www.apacer.com
Fax: +886-2-2698-2889
th
th
Serial ATA Flash Drive
AP-SAFD255AXxxxxS-XXT
Features:
Standard Serial ATA 2.6 (Gen. 2)
–
Serial ATA 2.6 (Gen. 2)
–
SATA II, 3.0 Gbps
–
ATA-compatible command set
Capacities
–
8, 16, 32, 64 GB
Performance*
–
Burst read/write: 300 MB/sec
–
Sustained read: up to 230 MB/sec
–
Sustained write: up to 175 MB/sec
Intelligent endurance design
–
Built-in hardware ECC, enabling up to
14/28 bit correction per 1K bytes
–
Static wear-leveling scheme together
with dynamical block allocation to
significantly increase the lifetime of a
flash device and optimize the disk
performance
–
Flash bad-block management
–
S.M.A.R.T.
–
Power Failure Management
–
ATA Secure Erase
–
Trim
NAND Flash Type: SLC
*Varies from capacities.
Zero power data retention
–
No battery required for data storage
Temperature ranges
–
Operation:
Standard: 0° to 70°
C
C
Extended Temperature: -40° to 85°C
C
–
Storage: -40° to 100°
C
C
Supply voltage
–
5.0 V
±
5%
Low power consumption*
–
Active mode: 535 mA@5.0 V
–
Idle mode: 94 mA@5.0 V
Form factor
–
2.5 inch
Connector
–
7-pin SATA male connector
–
15-pin SATA power connector
RoHS compliant
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© 2011 Apacer Technology Inc.
Rev. 1.2
Serial ATA Flash Drive
AP-SAFD255AXxxxxS-XXT
Table of Contents
1. Product Description ................................................................................................. 3
1.1 Introduction .................................................................................................................................. 3
1.2 Functional Block Diagram........................................................................................................... 3
1.3 ATA Mode Support....................................................................................................................... 4
1.4 Capacity Specification ................................................................................................................. 4
1.5 Performance ................................................................................................................................. 4
1.6 Pin Assignments .......................................................................................................................... 5
2. Software Interface .................................................................................................... 7
2.1 Command Set ............................................................................................................................... 7
3. Flash Management ................................................................................................... 8
3.1 Error Correction/Detection.......................................................................................................... 8
3.2 Bad Block Management............................................................................................................... 8
3.3 Wear Leveling ............................................................................................................................... 8
3.4 Power Failure Management......................................................................................................... 8
3.5 ATA Secure Erase ........................................................................................................................ 8
3.6 S.M.A.R.T....................................................................................................................................... 9
3.7 TRIM............................................................................................................................................... 9
4. Environmental Specifications ............................................................................... 10
4.1 Environments ............................................................................................................................. 10
4.2 Mean Time Between Failures (MTBF) ...................................................................................... 10
4.3 Certification and Compliance ................................................................................................... 10
5. Electrical Characteristics ...................................................................................... 11
5.1 Operating Voltage ...................................................................................................................... 11
5.2 Power Consumption .................................................................................................................. 11
6. Physical Characteristics........................................................................................ 12
6.1 Plastic Housing .......................................................................................................................... 12
6.2 Metal Housing............................................................................................................................. 13
7. Product Ordering Information ............................................................................... 14
7.1 Product Code Designations ...................................................................................................... 14
7.2 Valid Combinations.................................................................................................................... 15
2
© 2011 Apacer Technology Inc.
Rev. 1.2
Serial ATA Flash Drive
AP-SAFD255AXxxxxS-XXT
1. Product Description
1.1
Introduction
Apacer’s Serial ATA Flash Drive (SAFD) 255 is a solid-state disk (SSD) drive that contains a controller,
embedded firmware, and flash media along with a male connector. Using single-level cell (SLC) NAND flash
memory devices, the SAFD 255 interfaces with the host allowing data to be seamlessly transferred between
the host and the flash devices.
The SAFD 255 is designed with a single-chip controller, offering capacities of up to 64 gigabytes and providing
full support for the SATA II high-speed interface standard. It can operate at burst access rates of up to 300
megabytes per second, which is much faster than any other solid-state or traditional SATA drive currently
available on the market.
In addition to buffer management through dynamical allocation, the SAFD 255 adopts the Apacer-specific
static wear-leveling scheme to allow uniform use of all storage blocks, ensuring that the lifetime of a flash
media can be significantly increased and the disk performance is optimized as well. The SAFD 255 provides
the S.M.A.R.T. feature that follows the SATA Rev. 2.6, ATA/ATAPI-7 specifications and uses the standard
SMART command B0h to read data from the drive. This feature protects the user from unscheduled downtime
by monitoring and storing critical drive performance.
1.2
Functional Block Diagram
The SAFD 255 includes a single-chip SATA II Controller and the flash media, as well as the SATA standard
interface. The controller integrates the flash management unit with the controller itself to support multi-channel,
multi-bank flash arrays. Figure 1-1 shows the functional block diagram.
Figure 1-1
Apacer SAFD 255 block diagram
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© 2011 Apacer Technology Inc.
Rev. 1.2
Serial ATA Flash Drive
AP-SAFD255AXxxxxS-XXT
1.3
ATA Mode Support
Up to PIO mode-4
Up to Multiword DMA mode-2
Up to UDMA mode-5
The SAFD 255 provides ATA mode support as follows:
1.4
Capacity Specification
Capacity specification of the SAFD 255 product family is available as shown in Table 1-1. It lists the specific
capacity, the default numbers of logical cylinders and heads, and the number of logical sectors per track for
each product line.
Table 1-1
Capacity specification
Capacity
8 GB
16 GB
32 GB
64 GB
Total Bytes*
7,913,816,064
15,842,017,280
31,675,645,952
63,351,160,832
Cylinders
15,334
16,383
16,383
16,383
Heads
16
16
16
16
Sectors
63
63
63
63
Max LBA**
15,456,672
30,941,440
61,866,496
123,732,736
*Display of total bytes varies from file systems.
**Cylinders, heads or sectors are not applicable for these capacities. Only LBA addressing applies.
1.5
Performance
Performance of the SAFD 255 is shown in Table 1-2.
Table 1-2
Performance specification
Capacity
Performance
Sustained Read
(MB/s)
Sustained Write
(MB/s)
8GB
230
85
16GB
230
180
32GB
230
170
64GB
230
175
Note: Performance varies from flash configurations.
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© 2011 Apacer Technology Inc.
Rev. 1.2
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