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Why does the hdd read speed drop some time after connecting it?
I'm trying to recover data from a broken hdd.
I use the ddrescue utility (in fact, this is not important).
The strange thing is that immediately after connecting the disk, the speed of reading from it is several Mb / s. but after 20-30 seconds, it drops to a few bytes and does not come back. After turning off and reconnecting the disk, the speed again increases by 20-30 seconds.
Here is smartctl
sudo smartctl --all /dev/sdd
smartctl 6.4 2015-06-04 r4109 [x86_64-linux-4.3.3-2-ARCH] (local build)
Copyright (C) 2002-15, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Blue Mobile
Device Model: WDC WD2500LPCX-24C6HT0
Serial Number: WD-WXB1A549X3UT
LU WWN Device Id: 5 0014ee 65a155052
Firmware Version: 02.01A02
User Capacity: 250,059,350,016 bytes [250 GB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-2 (minor revision not indicated)
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 1.5 Gb/s)
Local Time is: Tue Jan 19 12:09:54 2016 EET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection: Disabled.
Self-test execution status: ( 0) The previous self-test routine completed
without error or no self-test has ever
been run.
Total time to complete Offline
data collection: ( 4560) seconds.
Offline data collection
capabilities: (0x7b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 56) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x7035) SCT Status supported.
SCT Feature Control supported.
SCT Data Table supported.
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 100 253 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0027 100 253 021 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 2
5 Reallocated_Sector_Ct 0x0033 192 192 140 Pre-fail Always - 369
7 Seek_Error_Rate 0x002f 100 253 051 Pre-fail Always - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 0
10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 2
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 1
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 1
194 Temperature_Celsius 0x0022 114 113 000 Old_age Always - 29
196 Reallocated_Event_Count 0x0032 001 001 000 Old_age Always - 369
197 Current_Pending_Sector 0x0032 198 198 000 Old_age Always - 95
198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 253 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0
240 Head_Flying_Hours 0x0032 100 100 000 Old_age Always - 0
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
No self-tests have been logged. [To run self-tests, use: smartctl -t]
SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
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The speed drops because the screw starts error handling.
To turn it off, you need a special software and experience.
If you really want to do it yourself, then the cheapest thing is to buy WDMarvel for a month wdmarvel.com/ru But what
's the
point for the sake of one screw?
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