Values for WD idle time in Linux

There is a tool called idle3ctl which can disable, get or set the idle3 timer on Western Digital hard drives. Idle3ctl can be used as an alternative to the official wdidle3.exe proprietary utility, without the need to reboot in a DOS environement. Idle3ctl is an independant project, unrelated in any way to Western Digital Corp.

To set idle3 timer raw value, option -s must be used. Value must be an integer between 1 and 255. The idle3 timer is set in 0.1s for the 1-128 range, and in 30s for the 129-255 range. Example:

# idle3ctl -s190 /dev/sdc
Idle3 timer set to 190 (0xbe)
Please power cycle your drive off and on for the new
setting to be taken into account. A reboot will not be enough!

# idle3ctl -g /dev/sdc
Idle3 timer set to 190 (0xbe)

Here is the snag, I had to do some math to be able to figure out the correct value. So I created a table for you, so you don’t have to! Enjoy.

Value Seconds Minutes
1 0.10 0.00
2 0.20 0.00
3 0.30 0.01
4 0.40 0.01
5 0.50 0.01
6 0.60 0.01
7 0.70 0.01
8 0.80 0.01
9 0.90 0.02
10 1.00 0.02
11 1.10 0.02
12 1.20 0.02
13 1.30 0.02
14 1.40 0.02
15 1.50 0.03
16 1.60 0.03
17 1.70 0.03
18 1.80 0.03
19 1.90 0.03
20 2.00 0.03
21 2.10 0.04
22 2.20 0.04
23 2.30 0.04
24 2.40 0.04
25 2.50 0.04
26 2.60 0.04
27 2.70 0.05
28 2.80 0.05
29 2.90 0.05
30 3.00 0.05
31 3.10 0.05
32 3.20 0.05
33 3.30 0.06
34 3.40 0.06
35 3.50 0.06
36 3.60 0.06
37 3.70 0.06
38 3.80 0.06
39 3.90 0.07
40 4.00 0.07
41 4.10 0.07
42 4.20 0.07
43 4.30 0.07
44 4.40 0.07
45 4.50 0.08
46 4.60 0.08
47 4.70 0.08
48 4.80 0.08
49 4.90 0.08
50 5.00 0.08
51 5.10 0.08
52 5.20 0.09
53 5.30 0.09
54 5.40 0.09
55 5.50 0.09
56 5.60 0.09
57 5.70 0.09
58 5.80 0.10
59 5.90 0.10
60 6.00 0.10
61 6.10 0.10
62 6.20 0.10
63 6.30 0.11
64 6.40 0.11
65 6.50 0.11
66 6.60 0.11
67 6.70 0.11
68 6.80 0.11
69 6.90 0.12
70 7.00 0.12
71 7.10 0.12
72 7.20 0.12
73 7.30 0.12
74 7.40 0.12
75 7.50 0.13
76 7.60 0.13
77 7.70 0.13
78 7.80 0.13
79 7.90 0.13
80 8.00 0.13
81 8.10 0.14
82 8.20 0.14
83 8.30 0.14
84 8.40 0.14
85 8.50 0.14
86 8.60 0.14
87 8.70 0.15
88 8.80 0.15
89 8.90 0.15
90 9.00 0.15
91 9.10 0.15
92 9.20 0.15
93 9.30 0.16
94 9.40 0.16
95 9.50 0.16
96 9.60 0.16
97 9.70 0.16
98 9.80 0.16
99 9.90 0.17
100 10.00 0.17
101 10.10 0.17
102 10.20 0.17
103 10.30 0.17
104 10.40 0.17
105 10.50 0.18
106 10.60 0.18
107 10.70 0.18
108 10.80 0.18
109 10.90 0.18
110 11.00 0.18
111 11.10 0.19
112 11.20 0.19
113 11.30 0.19
114 11.40 0.19
115 11.50 0.19
116 11.60 0.19
117 11.70 0.20
118 11.80 0.20
119 11.90 0.20
120 12.00 0.20
121 12.10 0.20
122 12.20 0.20
123 12.30 0.21
124 12.40 0.21
125 12.50 0.21
126 12.60 0.21
127 12.70 0.21
128 12.80 0.21
129 42.80 0.71
130 72.80 1.21
131 102.80 1.71
132 132.80 2.21
133 162.80 2.71
134 192.80 3.21
135 222.80 3.71
136 252.80 4.21
137 282.80 4.71
138 312.80 5.21
139 342.80 5.71
140 372.80 6.21
141 402.80 6.71
142 432.80 7.21
143 462.80 7.71
144 492.80 8.21
145 522.80 8.71
146 552.80 9.21
147 582.80 9.71
148 612.80 10.21
149 642.80 10.71
150 672.80 11.21
151 702.80 11.71
152 732.80 12.21
153 762.80 12.71
154 792.80 13.21
155 822.80 13.71
156 852.80 14.21
157 882.80 14.71
158 912.80 15.21
159 942.80 15.71
160 972.80 16.21
161 1002.80 16.71
162 1032.80 17.21
163 1062.80 17.71
164 1092.80 18.21
165 1122.80 18.71
166 1152.80 19.21
167 1182.80 19.71
168 1212.80 20.21
169 1242.80 20.71
170 1272.80 21.21
171 1302.80 21.71
172 1332.80 22.21
173 1362.80 22.71
174 1392.80 23.21
175 1422.80 23.71
176 1452.80 24.21
177 1482.80 24.71
178 1512.80 25.21
179 1542.80 25.71
180 1572.80 26.21
181 1602.80 26.71
182 1632.80 27.21
183 1662.80 27.71
184 1692.80 28.21
185 1722.80 28.71
186 1752.80 29.21
187 1782.80 29.71
188 1812.80 30.21
189 1842.80 30.71
190 1872.80 31.21
191 1902.80 31.71
192 1932.80 32.21
193 1962.80 32.71
194 1992.80 33.21
195 2022.80 33.71
196 2052.80 34.21
197 2082.80 34.71
198 2112.80 35.21
199 2142.80 35.71
200 2172.80 36.21
201 2202.80 36.71
202 2232.80 37.21
203 2262.80 37.71
204 2292.80 38.21
205 2322.80 38.71
206 2352.80 39.21
207 2382.80 39.71
208 2412.80 40.21
209 2442.80 40.71
210 2472.80 41.21
211 2502.80 41.71
212 2532.80 42.21
213 2562.80 42.71
214 2592.80 43.21
215 2622.80 43.71
216 2652.80 44.21
217 2682.80 44.71
218 2712.80 45.21
219 2742.80 45.71
220 2772.80 46.21
221 2802.80 46.71
222 2832.80 47.21
223 2862.80 47.71
224 2892.80 48.21
225 2922.80 48.71
226 2952.80 49.21
227 2982.80 49.71
228 3012.80 50.21
229 3042.80 50.71
230 3072.80 51.21
231 3102.80 51.71
232 3132.80 52.21
233 3162.80 52.71
234 3192.80 53.21
235 3222.80 53.71
236 3252.80 54.21
237 3282.80 54.71
238 3312.80 55.21
239 3342.80 55.71
240 3372.80 56.21
241 3402.80 56.71
242 3432.80 57.21
243 3462.80 57.71
244 3492.80 58.21
245 3522.80 58.71
246 3552.80 59.21
247 3582.80 59.71
248 3612.80 60.21
249 3642.80 60.71
250 3672.80 61.21
251 3702.80 61.71
252 3732.80 62.21
253 3762.80 62.71
254 3792.80 63.21
255 3822.80 63.71

Alternatively, the same can be achieved via smartctl tool. Read my next article about how to do that.

That’s all. Good luck not breaking your drive! :-)

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