Низкая скорость жесткого диска

hdparm -t /dev/sda
Timing buffered disk reads: 288 MB in  3.01 seconds =  95.62 MB/sec
hdparm -t /dev/sdb
Timing buffered disk reads:  32 MB in  3.11 seconds =  10.29 MB/sec
hdparm -t /dev/sdс
Timing buffered disk reads: 436 MB in  3.02 seconds = 144.53 MB/sec

Расположение    устройство SATA B    Размер диска    1.40 TB
Производитель и модель    ATA SAMSUNG HD153WI
Offline data collection status    Offline data collection activity was never started.
Auto Offline Data Collection: Disabled.
Self-test execution status    The previous self-test routine completed without error or no self-test has ever been run.
Total time to complete Offline data collection    18600 seconds.
Offline data collection capabilities    SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new command.
Offline surface scan supported.
Self-test supported.
No Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities    Saves SMART data before entering power-saving mode.
Supports SMART auto save timer.
Error logging capability    Error logging supported.
General Purpose Logging supported.
Short self-test routine recommended polling time    2 minutes.
Extended self-test routine recommended polling time    255 minutes.
SCT capabilities    SCT Status supported.
SCT Error Recovery Control supported.
SCT Feature Control supported.
SCT Data Table supported.
Raw Read Error Rate    195
Throughput Performance    0
Spin Up Time    12135
Start Stop Count    596
Reallocated Sector Ct    0
Seek Error Rate    0
Seek Time Performance    0
Power On Hours    7594
Spin Retry Count    0
Calibration Retry Count    0
Power Cycle Count    654
G-Sense Error Rate    9
Power-Off Retract Count    0
Temperature Celsius    31
Hardware ECC Recovered    0
Reallocated Event Count    0
Current Pending Sector    0
Offline Uncorrectable    0
Multi Zone Error Rate    0
Load Retry Count    0
Load Cycle Count    13214

# hdparm -iI /dev/sdb

/dev/sdb:
 Model=SAMSUNG HD153WI, FwRev=1AN10003, SerialNo=S1UVJ1WZ501566
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
 BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=2930277168
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
 AdvancedPM=yes: disabled (255) WriteCache=disabled
 Drive conforms to: unknown:  ATA/ATAPI-0,1,2,3,4,5,6,7
 * signifies the current active mode
ATA device, with non-removable media
        Model Number:       SAMSUNG HD153WI
        Serial Number:      S1UVJ1WZ501566
        Firmware Revision:  1AN10003
        Transport:          Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6
Standards:
        Used: unknown (minor revision code 0x0028)
        Supported: 8 7 6 5
        Likely used: 8
Configuration:
        Logical         max     current
        cylinders       16383   16383
        heads           16      16
        sectors/track   63      63
        --
        CHS current addressable sectors:   16514064
        LBA    user addressable sectors:  268435455
        LBA48  user addressable sectors: 2930277168
        Logical  Sector size:                   512 bytes
        Physical Sector size:                   512 bytes
        device size with M = 1024*1024:     1430799 MBytes
        device size with M = 1000*1000:     1500301 MBytes (1500 GB)
        cache/buffer size  = unknown
        Form Factor: 3.5 inch
        Nominal Media Rotation Rate: 5400
Capabilities:
        LBA, IORDY(can be disabled)
        Queue depth: 32
        Standby timer values: spec'd by Standard, no device specific minimum
        R/W multiple sector transfer: Max = 16  Current = ?
        Advanced power management level: 254
        Recommended acoustic management value: 254, current value: 128
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4
             Cycle time: no flow control=120ns  IORDY flow control=120ns
Commands/features:
        Enabled Supported:
           *    SMART feature set
                Security Mode feature set
           *    Power Management feature set
                Write cache
           *    Look-ahead
           *    Host Protected Area feature set
           *    WRITE_BUFFER command
           *    READ_BUFFER command
           *    NOP cmd
           *    DOWNLOAD_MICROCODE
           *    Advanced Power Management feature set
                Power-Up In Standby feature set
           *    SET_FEATURES required to spinup after power up
                SET_MAX security extension
           *    Automatic Acoustic Management feature set
           *    48-bit Address feature set
           *    Device Configuration Overlay feature set
           *    Mandatory FLUSH_CACHE
           *    FLUSH_CACHE_EXT
           *    SMART error logging
           *    SMART self-test
           *    General Purpose Logging feature set
           *    64-bit World wide name
           *    IDLE_IMMEDIATE with UNLOAD
           *    WRITE_UNCORRECTABLE_EXT command
           *    {READ,WRITE}_DMA_EXT_GPL commands
           *    Segmented DOWNLOAD_MICROCODE
           *    Gen1 signaling speed (1.5Gb/s)
           *    Gen2 signaling speed (3.0Gb/s)
           *    Native Command Queueing (NCQ)
           *    Host-initiated interface power management
           *    Phy event counters
           *    Idle-Unload when NCQ is active
           *    NCQ priority information
           *    DMA Setup Auto-Activate optimization
                Device-initiated interface power management
           *    Software settings preservation
           *    SMART Command Transport (SCT) feature set
           *    SCT Long Sector Access (AC1)
           *    SCT LBA Segment Access (AC2)
           *    SCT Error Recovery Control (AC3)
           *    SCT Features Control (AC4)
           *    SCT Data Tables (AC5)
Security:
        Master password revision code = 65534
                supported
        not     enabled
        not     locked
        not     frozen
        not     expired: security count
                supported: enhanced erase
        296min for SECURITY ERASE UNIT. 296min for ENHANCED SECURITY ERASE UNIT.
Logical Unit WWN Device Identifier: 50024e90037ea509
        NAA             : 5
        IEEE OUI        : 0024e9
        Unique ID       : 0037ea509
Checksum: correct