Tenho criado algumas imagens PNG com alguns mapas nos últimos dias (usando R). Depois que as imagens terminam, eu as movo para uma pasta separada chamada "ok", para não correr o risco de sobrescrevê-las mais tarde. Porém, algumas dessas imagens estão ficando completamente brancas alguns dias depois, outras estão retornando a um estado anterior (com apenas algumas camadas de shapefiles nelas), que nem tenho certeza se gerei em algum momento ou não (Acho que sim, já que fiz isso com alguns deles). Até mesmo as imagens brancas mantêm seu tamanho real em bytes, embora pareçam completamente brancas em muitos programas.
pngcheckdiz sobre uma dessas imagens, totalmente branca - suponha que o nome do arquivo seja file.png:
file.png additional data after IEND chunk
ERROR: file.png
Executar um histograma com ImageMagick no mesmo arquivo retorna:
convert file.png -define histogram:unique-colors=true -format %c histogram:info:-
9000000: (255,255,255) #FFFFFF white
o que significa que realmente ficou todo branco (a imagem original tem 3000x3000 pixels).
Estou usando o Debian 9. A última vez que executei um autoteste neste HD (com discos gnome), ele disse:
Disk is OK, 43 bad sectors.
Agora fiz o mesmo teste novamente e ele disse a mesma coisa. O que deveria significar que nenhum novo setor defeituoso apareceu. É um HDD normal, não um SSD. Aqui está o resultado completo:
E os resultados de smartctl -a:
smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.9.0-9-amd64] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Seagate Constellation ES (SATA)
Device Model: ST32000644NS
Serial Number: 9WM0CKBJ
LU WWN Device Id: 5 000c50 01a8899f1
Firmware Version: GG15
User Capacity: 2,000,398,934,016 bytes [2.00 TB]
Sector Size: 512 bytes logical/physical
Rotation Rate: 7200 rpm
Device is: In smartctl database [for details use: -P show]
ATA Version is: ATA8-ACS T13/1699-D revision 4
SATA Version is: SATA 2.6, 3.0 Gb/s (current: 3.0 Gb/s)
Local Time is: Tue Jun 4 23:23:48 2019 -03
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: (0x82) Offline data collection activity
was completed without error.
Auto Offline Data Collection: Enabled.
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: ( 609) 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: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 339) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x10bd) SCT Status supported.
SCT Error Recovery Control supported.
SCT Feature Control supported.
SCT Data Table supported.
SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 075 063 044 Pre-fail Always - 32950755
3 Spin_Up_Time 0x0003 100 100 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 976
5 Reallocated_Sector_Ct 0x0033 099 099 036 Pre-fail Always - 43
7 Seek_Error_Rate 0x000f 081 060 030 Pre-fail Always - 130556579
9 Power_On_Hours 0x0032 080 080 000 Old_age Always - 17849
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 975
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0
188 Command_Timeout 0x0032 100 100 000 Old_age Always - 0
189 High_Fly_Writes 0x003a 098 098 000 Old_age Always - 2
190 Airflow_Temperature_Cel 0x0022 059 047 045 Old_age Always - 41 (Min/Max 24/42)
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 1
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 31
193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 977
194 Temperature_Celsius 0x0022 041 053 000 Old_age Always - 41 (0 18 0 0 0)
195 Hardware_ECC_Recovered 0x001a 024 018 000 Old_age Always - 32950755
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed without error 00% 17849 -
# 2 Short offline Completed without error 00% 15687 -
# 3 Extended offline Aborted by host 50% 14014 -
# 4 Extended offline Aborted by host 90% 13928 -
# 5 Short offline Completed without error 00% 13928 -
# 6 Short offline Completed without error 00% 13927 -
# 7 Short offline Aborted by host 80% 13927 -
# 8 Short offline Completed without error 00% 2881 -
# 9 Short offline Completed without error 00% 2878 -
#10 Short offline Completed without error 00% 1562 -
#11 Short offline Completed without error 00% 151 -
#12 Short offline Completed without error 00% 48 -
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.
O que pode estar acontecendo?