西数蓝盘1T 绿盘2T在Ubuntu 10的表现!

hero

大家都发win下面的测试，我来个另类的，Linux Ubuntu 10.10下hdparm的测试结果


从上到下是绿盘2T 蓝盘1T 希捷250G（AAM都是最低值）



绿盘2T AAM 128 to 254

Edison

C:\Program Files (x86)\hdparm\bin>hdparm-run.bat -Tt hdc
hdparm -Tt hdc

WD 1TB 黑盘：

1. ATA device, with non-removable media
   
2.         Model Number:       WDC WD1002FAEX-00Z3A0
   
3.         Serial Number:      WD-WCATR2895237
   
4.         Firmware Revision:  05.01D05
   
5. Transport: Serial, SATA 1.0a, SATA II Extensions, SATA Rev 2.5
   
6. Standards:
   
7.         Supported: 8 7 6 5
   
8.         Likely used: 8
   
9. Configuration:
   
10.         Logical         max     current
    
11.         cylinders       16383   16383
    
12.         heads           16      16
    
13.         sectors/track   63      63
    
14.         --
    
15.         CHS current addressable sectors:   16514064
    
16.         LBA    user addressable sectors:  268435455
    
17.         LBA48  user addressable sectors: 1953525168
    
18.         device size with M = 1024*1024:      953869 MBytes
    
19.         device size with M = 1000*1000:     1000204 MBytes (1000 GB)
    
20. Capabilities:
    
21.         LBA, IORDY(can be disabled)
    
22.         Queue depth: 32
    
23.         Standby timer values: spec'd by Standard, with device specific minimum
    
24.         R/W multiple sector transfer: Max = 16  Current = 16
    
25.         Recommended acoustic management value: 128, current value: 254
    
26.         DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
    
27.              Cycle time: min=120ns recommended=120ns
    
28.         PIO: pio0 pio1 pio2 pio3 pio4
    
29.              Cycle time: no flow control=120ns  IORDY flow control=120ns
    
30. Commands/features:
    
31.         Enabled Supported:
    
32.            *    SMART feature set
    
33.                 Security Mode feature set
    
34.            *    Power Management feature set
    
35.            *    Write cache
    
36.            *    Look-ahead
    
37.            *    Host Protected Area feature set
    
38.            *    WRITE_BUFFER command
    
39.            *    READ_BUFFER command
    
40.            *    NOP cmd
    
41.            *    DOWNLOAD_MICROCODE
    
42.                 Power-Up In Standby feature set
    
43.            *    SET_FEATURES required to spinup after power up
    
44.                 SET_MAX security extension
    
45.                 Automatic Acoustic Management feature set
    
46.            *    48-bit Address feature set
    
47.            *    Device Configuration Overlay feature set
    
48.            *    Mandatory FLUSH_CACHE
    
49.            *    FLUSH_CACHE_EXT
    
50.            *    SMART error logging
    
51.            *    SMART self-test
    
52.            *    General Purpose Logging feature set
    
53.            *    64-bit World wide name
    
54.            *    {READ,WRITE}_DMA_EXT_GPL commands
    
55.            *    Segmented DOWNLOAD_MICROCODE
    
56.            *    SATA-I signaling speed (1.5Gb/s)
    
57.            *    SATA-II signaling speed (3.0Gb/s)
    
58.            *    unknown 76[3]
    
59.            *    Native Command Queueing (NCQ)
    
60.            *    Host-initiated interface power management
    
61.            *    Phy event counters
    
62.            *    unknown 76[12]
    
63.            *    DMA Setup Auto-Activate optimization
    
64.            *    Software settings preservation
    
65.            *    SMART Command Transport (SCT) feature set
    
66.            *    SCT Long Sector Access (AC1)
    
67.            *    SCT LBA Segment Access (AC2)
    
68.            *    SCT Features Control (AC4)
    
69.            *    SCT Data Tables (AC5)
    
70.                 unknown 206[12]
    
71.                 unknown 206[13]
    
72. Security:
    
73.         Master password revision code = 65534
    
74.                 supported
    
75.         not     enabled
    
76.         not     locked
    
77.         not     frozen
    
78.         not     expired: security count
    
79.                 supported: enhanced erase
    
80.         182min for SECURITY ERASE UNIT. 182min for ENHANCED SECURITY ERASE UNIT.

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hdc:
Timing cached reads:   468 MB in  2.01 seconds = 233.40 MB/sec
Timing buffered disk reads:  356 MB in  3.01 seconds = 118.19 MB/sec

aliguagua

看不懂，黑盘的缓存读取速度怎么那么低，另外Timing cached reads不是应该受接口的限制最高300MB/s的吗