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Secure Erase and Validation |
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The secure erase function wipes out data on the disk per the US Department of Defense standard DoD 5220.22-M specification. (Note, the specification requires three full triple-pass iterations for DoD compliance). This function is reserved for SCSI, SAS, SSA, and Fibre Channel disks only.
SMARTMon-UX has several commands relating to secure erase: -securecheckall Scans the entire disk, and reports the count and standard deviation for all 256 possible byte values on the entire disk. -securecheck n This performs the action in the same way as -securecheck, but it will automatically terminate after either a user-specified amount of time, or after it determines that the data is not random, whichever comes first.
-secure This is the function that implements the secure erase.
smartmon-ux -secure nFullCycles devicename
where n is a decimal number from 1-3 which corresponds to the number of full write cycles.
Additional Information Each cycle corresponds to three full passes where data is written to every addressable block. The first cycle sets every bit to one, the second sets every bit to zero. The final pass in each cycle writes random data. This process can take hours or days to complete, and if you want to insure that your old data is destroyed beyond all ability to recover it, then you should pulverize the disk drive into pieces no larger than a few square millimeters.
Our code takes advantage of specialized commands found in some disk drives to write a pattern to a large number of blocks quickly and efficiently. If your disk drive supports this command, then you will notice that the cycles that set and clear each bit run several times faster than a cycle that randomizes data.
Example C:\scratch>smartmonux-ux -secure 2 \\.\SCSI4Port4Path0Target1Lun0 SMARTMonUX [Release 1.32, Build 12-JAN-2007] - Copyright 2001-2006 SANtools, Inc. http://www.SANtools.com Discovered IBM DNEF-309170 S/N "AE1J3393" on \\.\SCSI4Port4Path0Target1Lun0 [SES] (Not Enabling SMART) [Bus/Port/ID.LUN=0/4/1.0](8748 MB)
**************************************************************************************** * Warning: You have initiated the secure erase function. No checks will be made to * * verify that the disk(s) aren't mounted or in use in any way. * * * * This will destroy all data on the disk, and can take hours or possibly * * days to complete. If you run this test on a logical disk (i.e, RAID), * * then some data will remain on the disks (metadata & parity data). If * * the disks are behind a RAID controller then you will need to run this * * software on the individual disk drives. * * * * If you have provided a list of drives to erase, then additional disks will * * be erased, one at a time as the process completes for a disk. * * * * You may specify the total number of passes that will be done. After an * * initial format to clear out data that might be in usable, but formerly * * reallocated sectors, then the software will perform your specified number * * of cycles. Each cycle consists of 3 full write passes. The first pass * * zeros every bit, then every bit is set to a one. The third write cycle * * writes random data to the entire disk. * ****************************************************************************************
Are you sure you want to erase the IBM DNEF-309170 disk at \\.\SCSI4Port4Path0Target1Lun0? Answer "YES" to begin: YES
The US DoD standard for secure erase specifies 3 iterations (each iteration is 3 passes). A single iteration is sufficient to prevent data recovery without forensic recovery equipment, and most users therefore specify a single iteration. How many iterations do you wish to perform? (2)): 2
Beginning secure erase where 6 full passes (2 iterations) will be invoked. Pass # 1: Setting every bit to 0 ... (Pass time: 9.5m, Total: 9.5m) Pass # 2: Setting every bit to 1 ... (Pass time: 9.5m, Total: 19.0m) Pass # 3: Randomizing every bit ... (Pass time: 29.6m, Total: 47.6m) Pass # 4: Setting every bit to 0 ... (Pass time: 9.5m, Total: 57.1m) Pass # 5: Setting every bit to 1 ... (Pass time: 9.5m, Total: 66.6m) Pass # 6: Randomizing every bit ... (Pass time: 29.6m, Total: 96.2m)
C:\scratch>
(Note: Due to the improved secure erase logic introduced in 1.35, the same disk drive reported the times below. The randomization phases run over twice as fast) Pass # 1: Setting every bit to 0 ... (Pass time: 9.5m, Total: 9.5m) Pass # 2: Setting every bit to 1 ... (Pass time: 9.5m, Total: 18.9m) Pass # 3: Randomizing every bit ... (Pass time: 9.8m, Total: 28.7m) Pass # 4: Setting every bit to 0 ... (Pass time: 9.5m, Total: 38.2m) Pass # 5: Setting every bit to 1 ... (Pass time: 9.5m, Total: 47.6m) Pass # 6: Randomizing every bit ... (Pass time: 9.7m, Total: 57.3m)
Disclaimer Use this feature at your own risk. SANtools will not guarantee that the secure erase will prevent your data from being recoverable. It is the responsibility of the user to insure that the process completes, and that the appropriate device was selected. If you select logical partitions, LUNs on RAID controllers, or logical disks, then this will not destroy any metadata or redundant data.
In addition, if your disk drives were short stroked (i.e., they present a usable capacity that is smaller then the actual physical capacity to the operating system, then not all of the disk will get erased. If you have any doubts as to whether or not the usable capacity is same as physical capacity, then invoke the command -capacity 0 first. This will resize the disk to the maximum capacity.
smartmon-ux -securecheck n devicename
where n is a decimal number from 1-3 which corresponds to the number of full write cycles.
Additional Information Each cycle corresponds to three full passes where data is written to every addressable block. The first cycle sets every bit to one, the second sets every bit to zero. The final pass in each cycle writes random data. This process can take hours or days to complete, and if you want to insure that your old data is destroyed beyond all ability to recover it, then you should pulverize the disk drive into pieces no larger than a few square millimeters.
Our code takes advantage of specialized commands found in some disk drives to write a pattern to a large number of blocks quickly and efficiently. If your disk drive supports this command, then you will notice that the cycles that set and clear each bit run several times faster than a cycle that randomizes data.
Example [root@ia64linux smartmon]# ./smartmon-ux -securecheck 1 /dev/sg9 SMARTMon-UX [Release 1.35, Build 18-JAN-2008] - Copyright 2001-2008 SANtools(R), Inc. http://www.SANtools.com Discovered IBM DNEF-309170 S/N "AJ1P8115" on Device /dev/sg9 (Adapter.Ch/ID.LUN=2.0/7.0) [SES] (Not Enabling SMART)(8748 MB)
Beginning SANtools secure erase verification test for IBM DNEF-309170 ... Test completed.
Report summary: IO errors for IBM DNEF-309170 at /dev/sg9: No problems found. Byte Percent TotalCount Byte Percent TotalCount Byte Percent TotalCount Byte Percent TotalCount 0 96.460 15804 1 0.079 13 2 0.031 5 3 0.000 0 4 0.018 3 5 0.031 5 6 0.024 4 7 0.067 11 8 0.031 5 9 0.006 1 A 0.018 3 B 0.031 5 C 0.006 1 D 0.000 0 E 0.012 2 F 0.000 0 10 0.043 7 11 0.031 5 12 0.000 0 13 0.043 7 14 0.000 0 15 0.000 0 16 0.000 0 17 0.000 0 18 0.006 1 19 0.018 3 1A 0.000 0 1B 0.012 2 1C 0.006 1 1D 0.000 0 1E 0.006 1 1F 0.006 1 20 0.043 7 21 0.006 1 22 0.000 0 23 0.012 2 24 0.006 1 25 0.006 1 26 0.000 0 27 0.000 0 28 0.000 0 29 0.000 0 2A 0.006 1 2B 0.006 1 2C 0.012 2 2D 0.073 12 2E 0.000 0 2F 0.000 0 30 0.067 11 31 0.043 7 32 0.049 8 33 0.018 3 34 0.049 8 35 0.018 3 36 0.049 8 37 0.067 11 38 0.031 5 39 0.043 7 3A 0.000 0 3B 0.000 0 3C 0.006 1 3D 0.000 0 3E 0.012 2 3F 0.018 3 40 0.006 1 41 0.012 2 42 0.018 3 43 0.006 1 44 0.018 3 45 0.012 2 46 0.031 5 47 0.000 0 48 0.006 1 49 0.018 3 4A 0.000 0 4B 0.006 1 4C 0.000 0 4D 0.012 2 4E 0.037 6 4F 0.012 2 50 0.031 5 51 0.006 1 52 0.018 3 53 0.000 0 54 0.000 0 55 0.024 4 56 0.049 8 57 0.012 2 58 0.000 0 59 0.006 1 5A 0.018 3 5B 0.000 0 5C 0.012 2 5D 0.000 0 5E 0.000 0 5F 0.000 0 60 0.018 3 61 0.116 19 62 0.049 8 63 0.043 7 64 0.067 11 65 0.085 14 66 0.012 2 67 0.031 5 68 0.012 2 69 0.079 13 6A 0.031 5 6B 0.012 2 6C 0.018 3 6D 0.012 2 6E 0.067 11 6F 0.043 7 70 0.031 5 71 0.006 1 72 0.079 13 73 0.073 12 74 0.104 17 75 0.018 3 76 0.024 4 77 0.006 1 78 0.000 0 79 0.012 2 7A 0.000 0 7B 0.000 0 7C 0.031 5 7D 0.006 1 7E 0.018 3 7F 0.000 0 80 0.037 6 81 0.012 2 82 0.000 0 83 0.024 4 84 0.000 0 85 0.000 0 86 0.006 1 87 0.000 0 88 0.006 1 89 0.000 0 8A 0.043 7 8B 0.049 8 8C 0.000 0 8D 0.000 0 8E 0.006 1 8F 0.000 0 90 0.000 0 91 0.000 0 92 0.000 0 93 0.000 0 94 0.000 0 95 0.006 1 96 0.000 0 97 0.000 0 98 0.006 1 99 0.000 0 9A 0.000 0 9B 0.000 0 9C 0.000 0 9D 0.000 0 9E 0.000 0 9F 0.000 0 A0 0.024 4 A1 0.000 0 A2 0.000 0 A3 0.000 0 A4 0.006 1 A5 0.000 0 A6 0.000 0 A7 0.000 0 A8 0.000 0 A9 0.006 1 AA 0.024 4 AB 0.000 0 AC 0.006 1 AD 0.000 0 AE 0.000 0 AF 0.000 0 B0 0.000 0 B1 0.012 2 B2 0.000 0 B3 0.000 0 B4 0.031 5 B5 0.006 1 B6 0.012 2 B7 0.006 1 B8 0.006 1 B9 0.006 1 BA 0.000 0 BB 0.018 3 BC 0.012 2 BD 0.031 5 BE 0.012 2 BF 0.012 2 C0 0.006 1 C1 0.012 2 C2 0.000 0 C3 0.006 1 C4 0.000 0 C5 0.006 1 C6 0.006 1 C7 0.012 2 C8 0.012 2 C9 0.006 1 CA 0.000 0 CB 0.012 2 CC 0.000 0 CD 0.049 8 CE 0.000 0 CF 0.000 0 D0 0.006 1 D1 0.006 1 D2 0.012 2 D3 0.000 0 D4 0.000 0 D5 0.000 0 D6 0.012 2 D7 0.000 0 D8 0.000 0 D9 0.012 2 DA 0.000 0 DB 0.000 0 DC 0.012 2 DD 0.000 0 DE 0.006 1 DF 0.000 0 E0 0.006 1 E1 0.000 0 E2 0.012 2 E3 0.006 1 E4 0.018 3 E5 0.006 1 E6 0.000 0 E7 0.000 0 E8 0.012 2 E9 0.000 0 EA 0.006 1 EB 0.031 5 EC 0.000 0 ED 0.000 0 EE 0.006 1 EF 0.000 0 F0 0.006 1 F1 0.006 1 F2 0.006 1 F3 0.006 1
The -securecheckall command reported the byte distribution in this manner for the drive.
Byte Percent TotalCount Byte Percent TotalCount Byte Percent TotalCount Byte Percent TotalCount 0 90.269 8280514948 1 0.030 2719293 2 0.044 4074225 3 0.044 4073945 4 0.015 1358881 5 0.030 2716384 6 0.015 1358167 7 0.030 2715616 8 0.000 868 9 0.030 2715410 A 0.015 1358393 B 0.074 6787828 C 0.030 2715676 D 0.030 2715813 E 0.074 6787691 F 0.015 1358379 10 0.000 1203 11 0.000 605 12 0.000 1164 13 0.015 1358258 14 0.030 2715650 15 0.015 1358104 16 0.030 2715541 17 0.030 2715050 18 0.000 1278 19 0.074 6788284 1A 0.015 1357602 1B 0.015 1357852 1C 0.044 4072937 1D 0.015 1357721 1E 0.015 1357906 1F 0.030 2715290 20 0.030 2716092 21 0.015 1357644 22 0.044 4072813 23 0.015 1357984 24 0.015 1357950 25 0.015 1357723 26 0.044 4072723 27 0.059 5430210 28 0.000 570 29 0.089 8145178 2A 0.074 6788119 2B 0.030 2715277 2C 0.015 1357971 2D 0.015 1358034 2E 0.059 5429833 2F 0.015 1357848 30 0.044 4073540 31 0.044 4072713 32 0.044 4072990 33 0.015 1358020 34 0.030 2716029 35 0.044 4072693 36 0.059 5430486 37 0.030 2715315 38 0.015 1358122 39 0.015 1358274 3A 0.015 1357727 3B 0.000 784 3C 0.030 2715393 3D 0.015 1358092 3E 0.030 2715660 3F 0.074 6787645 40 0.015 1358068 41 0.000 718 42 0.059 5436035 43 0.044 4073760 44 0.030 2715039 45 0.044 4072566 46 0.030 2715276 47 0.059 5430101 48 0.044 4073455 49 0.030 2715177 4A 0.030 2716231 4B 0.074 6793306 4C 0.030 2721185 4D 0.030 2715280 4E 0.059 5430253 4F 0.030 2715290 50 0.030 2715517 51 0.030 2715034 52 0.059 5430016 53 0.000 326 54 0.030 2715149 55 0.059 5430566 56 0.015 1363791 57 0.030 2715255 58 0.000 811 59 0.015 1357994 5A 2.172 199228412 5B 0.000 301 5C 0.030 2715130 5D 0.015 1357961 5E 0.104 9502348 5F 0.030 2715298 60 0.015 1357801 61 0.044 4072755 62 0.015 1357748 63 0.000 249 64 0.030 2715323 65 0.015 1357799 66 0.059 5431198 67 0.030 2715080 68 0.030 2715396 69 0.059 5429874 6A 0.000 429 6B 0.030 2715268 6C 0.030 2715037 6D 0.015 1357720 6E 0.044 4072687 6F 0.044 4072582 70 0.030 2715555 71 0.000 311 72 0.015 1358155 73 0.015 1357888 74 0.030 2715167 75 0.030 2715141 76 0.044 4073174 77 0.030 2715669 78 0.030 2715015 79 0.015 1357848 7A 0.030 2715250 7B 0.030 2715120 7C 0.030 2715692 7D 0.074 6787384 7E 0.000 425 7F 0.044 4072928 80 0.059 5430892 81 0.030 2715263 82 0.015 1358505 83 0.074 6787875 84 0.015 1358134 85 0.030 2715573 86 0.030 2715386 87 0.000 676 88 0.030 2715552 89 0.015 1358286 8A 0.015 1358115 8B 0.015 1358216 8C 0.030 2715387 8D 0.059 5430223 8E 0.015 1357855 8F 0.059 5430347 90 0.015 1358283 91 0.030 2715634 92 0.015 1357964 93 0.000 677 94 0.030 2715506 95 0.030 2715254 96 0.000 927 97 0.030 2715509 98 0.000 681 99 0.089 8145415 9A 0.015 1357962 9B 0.030 2715512 9C 0.000 424 9D 0.015 1357967 9E 0.030 2715632 9F 0.015 1358167 A0 0.030 2715529 A1 0.030 2716253 A2 0.044 4072789 A3 0.015 1358111 A4 0.015 1357834 A5 0.000 806 A6 0.044 4072873 A7 0.030 2715252 A8 0.030 2715509 A9 0.030 2715376 AA 0.044 4073192 AB 0.015 1358090 AC 0.015 1357850 AD 0.015 1358341 AE 0.000 675 AF 0.030 2715508 B0 0.030 2715516 B1 0.044 4073173 B2 0.030 2715505 B3 0.015 1358105 B4 0.015 1358494 B5 0.059 5430338 B6 0.000 699 B7 0.059 5430480 B8 0.030 2715782 B9 0.015 1358105 BA 0.000 810 BB 0.000 690 BC 0.030 2715644 BD 0.030 2715779 BE 0.044 4072674 BF 0.044 4072798 C0 0.044 4073371 C1 0.074 6787786 C2 0.059 5430217 C3 0.044 4072980 C4 0.030 2715254 C5 0.015 1357964 C6 0.030 2715388 C7 0.015 1358696 C8 0.030 2715620 C9 0.030 2715778 CA 0.030 2715638 CB 0.059 5430345 CC 0.044 4072792 CD 0.015 1358239 CE 0.030 2715635 CF 0.000 802 D0 0.030 2715400 D1 0.000 932 D2 0.044 4072812 D3 0.044 4072795 D4 0.030 2715506 D5 0.030 2715884 D6 0.059 5430847 D7 0.044 4072670 D8 0.044 4073186 D9 0.030 2715646 DA 0.015 1357971 DB 0.030 2715383 DC 0.044 4072798 DD 0.044 4073048 DE 0.000 550 DF 0.015 1358095 E0 0.030 2715540 E1 0.030 2715485 E2 0.015 1357987 E3 0.059 5430484 E4 0.030 2715398 E5 0.000 566 E6 0.044 4073310 E7 0.015 1357841 E8 0.000 745 E9 0.030 2715515 EA 0.030 2715386 EB 0.015 1358124 EC 0.044 4072794 ED 0.044 4072660 EE 0.015 1357837 EF 0.044 4072670 F0 0.044 4072834 F1 0.015 1358477 F2 0.059 5430340 F3 0.044 4072951 F4 0.030 2716624 F5 0.059 5430217 F6 0.015 1358097 F7 0.030 2715287 F8 0.030 2715542 F9 0.000 596 FA 0.059 5430431 FB 0.030 2715398 FC 0.059 5430479 FD 0.015 1358236 FE 0.000 710 FF 0.128 11751181
Total bytes analyzed above: 9173114880; on device: 9173114880 Note: The longest consecutive sequence is 38102016 bytes long, and standard deviation is 5.630. ** THIS DISK DOES NOT CONTAIN RANDOM DATA *** [root@ia64linux smartmon]#
This disk must have valid data on it. Notice the large number of zeros and higher percentages of digits 0-9. We run a single-pass secure erase, and then report the results.
[root@ia64linux smartmon]# ./smartmon-ux -secure 1 /dev/sg9 SMARTMon-UX [Release 1.35, Build 21-JAN-2008] - Copyright 2001-2008 SANtools(R), Inc. http://www.SANtools.com Discovered IBM DNEF-309170 S/N "AJ1P8115" on Device /dev/sg9 (Adapter.Ch/ID.LUN=2.0/7.0) [SES] (SMART enabled)(8748 MB)
**************************************************************************************** * Warning: You have initiated the secure erase function. No checks will be made to * * verify that the disk(s) aren't mounted or in use in any way. * * * * This will destroy all data on the disk, and can take hours or possibly * * days to complete. If you run this test on a logical disk (i.e, RAID), * * then some data will remain on the disks (metadata & parity data). If * * the disks are behind a RAID controller then you will need to run this * * software on the individual disk drives. * * * * If you have provided a list of drives to erase, then additional disks will * * be erased, one at a time as the process completes for a disk. * * * * You may specify the total number of passes that will be done. After an * * initial format to clear out data that might be in usable, but formerly * * reallocated sectors, then the software will perform your specified number * * of cycles. Each cycle consists of 3 full write passes. The first pass * * zeros every bit, then every bit is set to a one. The third write cycle * * writes random data to the entire disk. * ****************************************************************************************
Are you sure you want to erase the IBM DNEF-309170 disk at /dev/sg9? Answer "YES" to begin: YES
The US DoD standard for secure erase specifies 3 iterations (each iteration is 3 passes). A single iteration is sufficient to prevent data recovery without forensic recovery equipment, and most users therefore specify a single iteration. How many iterations do you wish to perform? (1)): 1
Beginning secure erase where 3 full passes (1 iteration) will be invoked. Pass # 1: Setting every bit to 0 ... (Pass time: 9.5m, Total: 9.5m) Pass # 2: Setting every bit to 1 ... (Pass time: 9.5m, Total: 18.9m) Pass # 3: Randomizing every bit ... (Pass time: 11.5m, Total: 30.4m) The device has successfully been erased.
O errors for IBM DNEF-309170 at /dev/sg9: No problems found. Byte Percent TotalCount Byte Percent TotalCount Byte Percent TotalCount Byte Percent 0 0.391 35829972 1 0.391 35833545 2 0.391 35828841 3 0.391 35831614 4 0.391 35828018 5 0.391 35845415 6 0.391 35827569 7 0.391 35842468 8 0.391 35829414 9 0.391 35832505 A 0.391 35832274 B 0.391 35829931 C 0.391 35830439 D 0.391 35834870 E 0.391 35839300 F 0.390 35819188 10 0.391 35841614 11 0.391 35829669 12 0.391 35829391 13 0.390 35816735 14 0.391 35832689 15 0.391 35830727 16 0.391 35825645 17 0.391 35830039 18 0.391 35836274 19 0.391 35821265 1A 0.391 35830096 1B 0.391 35822488 1C 0.390 35819790 1D 0.391 35834652 1E 0.391 35828673 1F 0.391 35828992 20 0.391 35825176 21 0.391 35831327 22 0.391 35830549 23 0.391 35836446 24 0.391 35827115 25 0.391 35828167 26 0.391 35836304 27 0.391 35842787 28 0.391 35834765 29 0.391 35835998 2A 0.391 35834606 2B 0.391 35824023 2C 0.391 35825272 2D 0.391 35835496 2E 0.391 35836011 2F 0.390 35811043 30 0.391 35834105 31 0.391 35837830 32 0.391 35835902 33 0.391 35823527 34 0.391 35834823 35 0.391 35829004 36 0.391 35836238 37 0.391 35831478 38 0.391 35839152 39 0.391 35833580 3A 0.391 35834182 3B 0.391 35835355 3C 0.391 35828933 3D 0.391 35840625 3E 0.391 35839028 3F 0.391 35836238 40 0.391 35833824 41 0.391 35840651 42 0.391 35827843 43 0.391 35823703 44 0.391 35825350 45 0.391 35825704 46 0.391 35826986 47 0.391 35826579 48 0.391 35824667 49 0.391 35825018 4A 0.391 35826353 4B 0.391 35832409 4C 0.391 35831285 4D 0.391 35833121 4E 0.391 35833779 4F 0.391 35834653 50 0.391 35826422 51 0.391 35829101 52 0.391 35831170 53 0.391 35839404 54 0.391 35834025 55 0.391 35836547 56 0.391 35839656 57 0.391 35834219 58 0.391 35838322 59 0.391 35842217 5A 0.391 35832608 5B 0.391 35830795 5C 0.391 35830398 5D 0.391 35841648 5E 0.391 35828385 5F 0.391 35843732 60 0.391 35829973 61 0.391 35840043 62 0.391 35834767 63 0.390 35816302 64 0.391 35837421 65 0.391 35828803 66 0.391 35838699 67 0.391 35834395 68 0.391 35829298 69 0.391 35830615 6A 0.391 35835097 6B 0.391 35829154 6C 0.391 35824419 6D 0.391 35831141 6E 0.391 35822070 6F 0.391 35834263 70 0.391 35827148 71 0.391 35837694 72 0.391 35827658 73 0.391 35837475 74 0.391 35828163 75 0.391 35838447 76 0.391 35835951 77 0.390 35817271 78 0.391 35825778 79 0.391 35829808 7A 0.391 35837156 7B 0.391 35834523 7C 0.391 35824324 7D 0.391 35833073 7E 0.391 35830341 7F 0.391 35831459 80 0.391 35842876 81 0.391 35831559 82 0.391 35834054 83 0.391 35832884 84 0.391 35839239 85 0.391 35830311 86 0.391 35827406 87 0.391 35825002 88 0.391 35833267 89 0.391 35828105 8A 0.391 35841893 8B 0.391 35839614 8C 0.391 35824686 8D 0.391 35833548 8E 0.391 35834591 8F 0.391 35839205 90 0.391 35831866 91 0.391 35841088 92 0.391 35846651 93 0.391 35833396 94 0.391 35834672 95 0.391 35835735 96 0.391 35826951 97 0.391 35839477 98 0.391 35831369 99 0.391 35837716 9A 0.391 35831697 9B 0.391 35840650 9C 0.391 35835059 9D 0.391 35826102 9E 0.391 35830481 9F 0.391 35835666 A0 0.391 35825973 A1 0.391 35828942 A2 0.391 35832435 A3 0.391 35828621 A4 0.391 35834144 A5 0.391 35831601 A6 0.391 35828446 A7 0.391 35843438 A8 0.391 35829797 A9 0.391 35824495 AA 0.391 35831540 AB 0.391 35834889 AC 0.391 35832530 AD 0.391 35833245 AE 0.391 35835582 AF 0.391 35830982 B0 0.391 35840199 B1 0.391 35830083 B2 0.391 35832403 B3 0.391 35833307 B4 0.391 35827928 B5 0.391 35843003 B6 0.391 35835190 B7 0.391 35837419 B8 0.391 35824222 B9 0.391 35826359 BA 0.391 35836523 BB 0.391 35834894 BC 0.391 35827413 BD 0.391 35833474 BE 0.391 35839098 BF 0.391 35834938 C0 0.391 35835834 C1 0.391 35842455 C2 0.391 35831998 C3 0.391 35833223 C4 0.391 35821668 C5 0.391 35836508 C6 0.391 35829402 C7 0.391 35829226 C8 0.391 35838460 C9 0.391 35823475 CA 0.391 35845628 CB 0.391 35837043 CC 0.391 35831381 CD 0.391 35831882 CE 0.391 35835077 CF 0.391 35832947 D0 0.391 35837892 D1 0.391 35829781 D2 0.391 35836569 D3 0.391 35841382 D4 0.391 35828180 D5 0.391 35821680 D6 0.391 35824102 D7 0.391 35844498 D8 0.391 35827409 D9 0.391 35828268 DA 0.391 35840052 DB 0.391 35841451 DC 0.391 35830459 DD 0.391 35835154 DE 0.391 35837332 DF 0.391 35830882 E0 0.391 35828163 E1 0.391 35835412 E2 0.391 35836631 E3 0.391 35835514 E4 0.391 35828177 E5 0.391 35833115 E6 0.391 35828199 E7 0.391 35830728 E8 0.391 35836584 E9 0.391 35831956 EA 0.391 35831583 EB 0.391 35829410 EC 0.391 35822917 ED 0.391 35823825 EE 0.391 35827531 EF 0.391 35835787 F0 0.391 35846811 F1 0.391 35825090 F2 0.391 35832101 F3 0.391 35832957 F4 0.391 35839045 F5 0.391 35850406 F6 0.391 35836066 F7 0.391 35837913 F8 0.391 35831573 F9 0.391 35825461 FA 0.391 35827415 FB 0.391 35841653 FC 0.391 35830668 FD 0.391 35838418 FE 0.391 35834696 FF 0.391 35835358
Total bytes analyzed above: 9173114880; on device: 9173114880 Note: The longest consecutive sequence is 5 bytes long, and standard deviation is 0.000.
Program Ended.
Below is from another analysis and another secure erase pass. Note how well the random number generator distributes 1s and zeros. Each of the 256 possible byte values are written 0.391% of the time, and standard deviation is rounded down to zero. Subsequent passes almost always report the same standard deviation of 0.391% for every byte.
Byte Percent TotalCount Byte Percent TotalCount Byte Percent TotalCount Byte Percent TotalCount 0 0.391 35833707 1 0.391 35833028 2 0.391 35833746 3 0.391 35825379 4 0.391 35831376 5 0.391 35838552 6 0.391 35835833 7 0.391 35827386 8 0.391 35836805 9 0.391 35823769 A 0.391 35833986 B 0.391 35824618 C 0.391 35831460 D 0.391 35832262 E 0.391 35828086 F 0.391 35834474 10 0.391 35835466 11 0.391 35838283 12 0.391 35832077 13 0.391 35832956 14 0.391 35833265 15 0.391 35829840 16 0.391 35842722 17 0.391 35829533 18 0.391 35826237 19 0.391 35822378 1A 0.391 35833117 1B 0.391 35831175 1C 0.391 35838283 1D 0.391 35828460 1E 0.391 35839982 1F 0.391 35832747 20 0.391 35827162 21 0.391 35828758 22 0.391 35830946 23 0.391 35836360 24 0.391 35836717 25 0.391 35839408 26 0.391 35821040 27 0.391 35825631 28 0.391 35832739 29 0.391 35832075 2A 0.391 35834083 2B 0.391 35835180 2C 0.391 35839779 2D 0.391 35834717 2E 0.391 35837155 2F 0.391 35828021 30 0.391 35837106 31 0.391 35828067 32 0.391 35825498 33 0.391 35824125 34 0.391 35826869 35 0.391 35831339 36 0.391 35828222 37 0.390 35820030 38 0.391 35830800 39 0.391 35829814 3A 0.391 35832758 3B 0.391 35837251 3C 0.391 35823200 3D 0.391 35829394 3E 0.391 35830338 3F 0.391 35833421 40 0.391 35833429 41 0.391 35834238 42 0.391 35836923 43 0.391 35838558 44 0.391 35839667 45 0.391 35834352 46 0.391 35831685 47 0.391 35836688 48 0.391 35835000 49 0.391 35835931 4A 0.391 35836251 4B 0.391 35839509 4C 0.391 35837401 4D 0.391 35844091 4E 0.391 35829000 4F 0.391 35833787 50 0.391 35826644 51 0.391 35839255 52 0.391 35834924 53 0.391 35823499 54 0.391 35831763 55 0.391 35823681 56 0.391 35838006 57 0.391 35832848 58 0.391 35835740 59 0.391 35824553 5A 0.391 35832107 5B 0.391 35828643 5C 0.391 35831402 5D 0.391 35839455 5E 0.391 35836769 5F 0.391 35833087 60 0.391 35833868 61 0.391 35828431 62 0.391 35829213 63 0.391 35841511 64 0.391 35824372 65 0.391 35828010 66 0.391 35831059 67 0.391 35833943 68 0.391 35839063 69 0.391 35833839 6A 0.391 35821287 6B 0.391 35842340 6C 0.391 35828064 6D 0.391 35831843 6E 0.391 35821119 6F 0.391 35839082 70 0.391 35835218 71 0.391 35828147 72 0.391 35834652 73 0.391 35839950 74 0.391 35834714 75 0.391 35830325 76 0.391 35824354 77 0.390 35819387 78 0.391 35840984 79 0.391 35833362 7A 0.391 35828972 7B 0.390 35820215 7C 0.391 35832008 7D 0.391 35837922 7E 0.391 35840449 7F 0.391 35836522 80 0.391 35838705 81 0.391 35827309 82 0.391 35837329 83 0.391 35832091 84 0.391 35823291 85 0.391 35828190 86 0.391 35831407 87 0.391 35824976 88 0.391 35824871 89 0.391 35824309 8A 0.391 35840238 8B 0.391 35831508 8C 0.391 35828130 8D 0.391 35839372 8E 0.391 35840670 8F 0.391 35822145 90 0.391 35834018 91 0.391 35824506 92 0.391 35834537 93 0.391 35826688 94 0.391 35831448 95 0.391 35840754 96 0.391 35837172 97 0.391 35837407 98 0.391 35842095 99 0.391 35834791 9A 0.391 35830020 9B 0.391 35839427 9C 0.390 35819530 9D 0.391 35830908 9E 0.391 35832220 9F 0.391 35824178 A0 0.391 35833780 A1 0.391 35832884 A2 0.391 35830435 A3 0.391 35837062 A4 0.391 35833475 A5 0.391 35842450 A6 0.391 35843017 A7 0.391 35840131 A8 0.391 35824430 A9 0.391 35827486 AA 0.391 35829485 AB 0.391 35839303 AC 0.391 35835607 AD 0.391 35834223 AE 0.391 35823586 AF 0.390 35811523 B0 0.391 35831265 B1 0.391 35835937 B2 0.391 35826103 B3 0.391 35831500 B4 0.391 35826127 B5 0.391 35826918 B6 0.391 35832064 B7 0.391 35832895 B8 0.391 35827545 B9 0.391 35825590 BA 0.391 35838479 BB 0.391 35829588 BC 0.391 35832674 BD 0.391 35829762 BE 0.391 35842889 BF 0.391 35831542 C0 0.391 35834933 C1 0.391 35842573 C2 0.391 35828205 C3 0.391 35831076 C4 0.391 35831198 C5 0.391 35831663 C6 0.391 35822112 C7 0.391 35836354 C8 0.391 35838467 C9 0.391 35826302 CA 0.391 35835666 CB 0.391 35839544 CC 0.391 35833268 CD 0.391 35834774 CE 0.391 35827933 CF 0.391 35831123 D0 0.391 35833236 D1 0.391 35835632 D2 0.391 35829711 D3 0.391 35833305 D4 0.391 35833423 D5 0.391 35833328 D6 0.391 35838977 D7 0.391 35838977 D8 0.391 35843830 D9 0.391 35823848 DA 0.391 35839168 DB 0.391 35832321 DC 0.391 35830628 DD 0.391 35838210 DE 0.391 35823853 DF 0.391 35835573 E0 0.391 35830561 E1 0.391 35831060 E2 0.391 35829247 E3 0.391 35824495 E4 0.391 35836808 E5 0.391 35837159 E6 0.391 35838624 E7 0.391 35834402 E8 0.391 35833637 E9 0.391 35830347 EA 0.391 35833533 EB 0.391 35832394 EC 0.391 35825744 ED 0.391 35835509 EE 0.391 35828629 EF 0.391 35821286 F0 0.391 35845849 F1 0.391 35837271 F2 0.391 35831886 F3 0.391 35839247 F4 0.391 35834102 F5 0.391 35841838 F6 0.391 35833509 F7 0.391 35833341 F8 0.391 35835834 F9 0.391 35827056 FA 0.391 35850286 FB 0.391 35826441 FC 0.391 35837663 FD 0.391 35834206 FE 0.391 35834107 FF 0.391 35833501
Total bytes analyzed above: 9173114880; on device: 9173114880 Note: The longest consecutive sequence is 6 bytes long, and standard deviation is 0.000.
Program Ended.
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