目前在用的 All in One NAS 上面挂了一块远古时期的 2.5 寸西数 500G 蓝盘存数据，我自己都不记得这款硬盘是哪里来的，也许是之前的笔记本电脑里拆下来的 N 手盘。不过好在它还蛮争气，连续服役这么多年依旧没有坏道。
硬盘在平时经常出现 "啧啧" 的磁头归位声，隔几分钟就有一次，一开始以为是黑群晖的配置没有做好，反复尝试多次后发现不是群晖问题: 硬盘基本不会自行休眠，即使休眠了，也马上会被自己唤醒。其实之前在笔记本上用的时候也有这样的声音，只是当时没特别关注。
所谓的 "C1 门"，就是指 SMART 值中的 C1 数据异常，百度说超过 2W 就是中招了，我一看好家伙，已经 5W 多了
(smartctl 读出来的并不是 C1，但是 Windows 下的软件读出来是 C1)
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 0x0b00 200 200 051 Old_age Offline - 105
3 Spin_Up_Time 0x0c00 150 143 021 Old_age Offline - 1466
4 Start_Stop_Count 0xb700 093 093 000 Old_age Offline - 7450
5 Reallocated_Sector_Ct 0xb800 200 200 140 Old_age Offline - 0
7 Seek_Error_Rate 0xbb00 200 200 051 Old_age Offline - 0
9 Power_On_Hours 0xbc00 085 085 000 Old_age Offline - 11431
10 Spin_Retry_Count 0xbe00 100 100 051 Old_age Offline - 0
11 Calibration_Retry_Count 0xbf00 100 100 000 Old_age Offline - 0
12 Power_Cycle_Count 0xc000 097 097 000 Old_age Offline - 3421
183 Runtime_Bad_Block 0xc100 100 100 000 Old_age Offline - 0
184 End-to-End_Error 0xc200 100 100 000 Old_age Offline - 0
187 Reported_Uncorrect 0xc300 100 100 000 Old_age Offline - 0
188 Command_Timeout 0xc400 100 081 000 Old_age Offline - 90195755035
190 Airflow_Temperature_Cel 0xc500 066 046 000 Old_age Offline - 34
191 G-Sense_Error_Rate 0xc600 001 001 000 Old_age Offline - 390
192 Power-Off_Retract_Count 0xc700 200 200 000 Old_age Offline - 417
193 Load_Cycle_Count 0xc800 182 182 000 Old_age Offline - 56199
194 Temperature_Celsius 0xf000 109 089 000 Old_age Offline - 34
195 Hardware_ECC_Recovered 0xf100 200 200 000 Old_age Offline - 0
196 Reallocated_Event_Count 0xf200 200 200 000 Old_age Offline - 0
197 Current_Pending_Sector 0xfe00 200 200 000 Old_age Offline - 0
198 Offline_Uncorrectable 0x0000 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x1800 200 200 000 Old_age Offline - 0
200 Multi_Zone_Error_Rate 0x0000 100 253 051 Old_age Offline - 0
240 Head_Flying_Hours 0x0000 088 088 000 Old_age Offline - 9354
241 Total_LBAs_Written 0x0000 200 200 000 Old_age Offline - 17932771727
242 Total_LBAs_Read 0x2000 200 200 000 Old_age Offline - 18618376569
254 Free_Fall_Sensor 0x0000 200 200 000 Old_age Offline - 0
导致问题的原因就是西数的固件有问题，磁头复位间隔设置得太短，导致它频繁回收，可以用 wdidle3 工具修改一下休眠时间。不过 Linux 下并没有 wdidle3 工具，所以要用一个第三方工具修改: idle3-tools
下载源码并编译，得到可执行文件
root@ayabe:~/work/idle3-tools-0.9.1# make
cc -g -O2 -W -Wall -Wbad-function-cast -Wcast-align -Wpointer-arith -Wcast-qual -Wshadow -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -fkeep-inline-functions -Wwrite-strings -Waggregate-return -Wnested-externs -Wtrigraphs -c -o idle3ctl.o idle3ctl.c
idle3ctl.c:47:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
47 | int check_WDC_drive()
| ^~~~~~~~~~~~~~~
idle3ctl.c:88:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
88 | int VSC_enable()
| ^~~~~~~~~~
idle3ctl.c:112:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
112 | int VSC_disable()
| ^~~~~~~~~~~
idle3ctl.c:136:5: warning: no previous prototype for ‘VSC_send_key’ [-Wmissing-prototypes]
136 | int VSC_send_key(char rw)
| ^~~~~~~~~~~~
idle3ctl.c:166:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
166 | int VSC_send_write_key()
| ^~~~~~~~~~~~~~~~~~
idle3ctl.c:173:5: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
173 | int VSC_send_read_key()
| ^~~~~~~~~~~~~~~~~
idle3ctl.c:182:5: warning: no previous prototype for ‘VSC_get_timer’ [-Wmissing-prototypes]
182 | int VSC_get_timer(unsigned char *timer)
| ^~~~~~~~~~~~~
idle3ctl.c:213:5: warning: no previous prototype for ‘VSC_set_timer’ [-Wmissing-prototypes]
213 | int VSC_set_timer(unsigned char timer)
| ^~~~~~~~~~~~~
idle3ctl.c:244:6: warning: no previous prototype for ‘cleanup’ [-Wmissing-prototypes]
244 | void cleanup(void)
| ^~~~~~~
idle3ctl.c:252:6: warning: no previous prototype for ‘show_version’ [-Wmissing-prototypes]
252 | void show_version(void)
| ^~~~~~~~~~~~
idle3ctl.c:258:6: warning: no previous prototype for ‘show_usage’ [-Wmissing-prototypes]
258 | void show_usage(void)
| ^~~~~~~~~~
cc -g -O2 -W -Wall -Wbad-function-cast -Wcast-align -Wpointer-arith -Wcast-qual -Wshadow -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -fkeep-inline-functions -Wwrite-strings -Waggregate-return -Wnested-externs -Wtrigraphs -c -o sgio.o sgio.c
cc -s -o idle3ctl idle3ctl.o sgio.o
#strip idle3ctl
root@ayabe:~/work/idle3-tools-0.9.1# ls -al
total 220
drwxr-xr-x 2 1000 1000 4096 Jul 11 19:58 .
drwxr-xr-x 3 root root 4096 Jul 11 19:57 ..
-rw-r--r-- 1 1000 1000 35148 May 31 2011 COPYING
-rwxr-xr-x 1 root root 26856 Jul 11 19:58 idle3ctl
-rw-r--r-- 1 1000 1000 1726 May 31 2011 idle3ctl.8
-rw-r--r-- 1 1000 1000 9158 May 31 2011 idle3ctl.c
-rw-r--r-- 1 root root 44360 Jul 11 19:58 idle3ctl.o
-rw-r--r-- 1 1000 1000 1821 May 31 2011 Makefile
-rw-r--r-- 1 1000 1000 13625 May 31 2011 sgio.c
-rw-r--r-- 1 1000 1000 5674 May 31 2011 sgio.h
-rw-r--r-- 1 root root 60824 Jul 11 19:58 sgio.o
把休眠等待时间设置为 300 秒
root@ayabe:~/work/idle3-tools-0.9.1# ./idle3ctl -s 300 /dev/sdb
Idle3 timer set to 44 (0x2c)
Please power cycle your drive off and on for the new setting to be taken into account. A reboot will not be enough!
提示我们需要完全关闭电源再启动而不是重启，关闭主机后拔掉电源线，等待半分钟左右再上电就行了