{"id":2023,"date":"2017-11-22T18:04:47","date_gmt":"2017-11-22T16:04:47","guid":{"rendered":"http:\/\/blog.atola.com\/?p=2023"},"modified":"2026-05-06T07:31:36","modified_gmt":"2026-05-06T05:31:36","slug":"calculating-segmented-hash-of-a-damaged-drive","status":"publish","type":"post","link":"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/","title":{"rendered":"Calculating segmented hash of a damaged drive"},"content":{"rendered":"<p lang=\"en-US\">When you work with a damaged device, and imaging can only be performed in multiple passes due to bad sectors or physically damaged areas or heads, it is impossible to calculate linear hash of the drive. This can become a serious challenge if you need to prove evidence integrity in the court of law. And it is for such cases that Atola Insight Forensic has Segmented hashing functionality.<\/p>\n<p lang=\"en-US\">According to the recommended workflow, run <i>Automatic <\/i><i>c<\/i><i>heckup <\/i>of the evidence drive.<\/p>\n<div id=\"attachment_2029\" style=\"width: 760px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-2029\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-2029 size-large\" src=\"https:\/\/blog.atola.com\/wp-content\/uploads\/2017\/11\/1-diagnostics-results-arrow-996x1024.png\" alt=\"\" width=\"750\" height=\"771\" srcset=\"https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/1-diagnostics-results-arrow-996x1024.png 996w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/1-diagnostics-results-arrow-146x150.png 146w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/1-diagnostics-results-arrow-292x300.png 292w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/1-diagnostics-results-arrow-768x789.png 768w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/1-diagnostics-results-arrow.png 1012w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><p id=\"caption-attachment-2029\" class=\"wp-caption-text\">Atola Insight Forensic: Automatic checkup of the evidence drive<\/p><\/div>\n<p lang=\"en-US\">If the drive has hardware or bad sector issues, it is likely that imaging will not be completed within one pass, and you can calculate the hash\u00a0for such drive only with Segmented hashing.<\/p>\n<p lang=\"en-US\">Furthermore, we recommend that you calculate hash and image the drive simultaneously: this way data on the drive is only read once for both processes and you avoid further deterioration of the drive:<\/p>\n<ol>\n<li lang=\"en-US\">Press on <i>Create new session <\/i>link in <i>Imaging <\/i>category of the left-side menu and select the target drive<\/li>\n<li lang=\"en-US\">Click on <i>Show settings <\/i>link in <i>Preset <\/i>line<\/li>\n<li lang=\"en-US\">Tick the box next to <i>Hash source during imaging<\/i><\/li>\n<li lang=\"en-US\">Select <i>Segmented <\/i>option in <i>Hash method <\/i>drop-down menu<\/li>\n<li lang=\"en-US\">Click <i>Start imaging <\/i>button<\/li>\n<\/ol>\n<div id=\"attachment_2030\" style=\"width: 896px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-2030\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-2030 size-full\" src=\"https:\/\/blog.atola.com\/wp-content\/uploads\/2017\/11\/2-imaging-settings-arrow.png\" alt=\"\" width=\"886\" height=\"981\" srcset=\"https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/2-imaging-settings-arrow.png 886w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/2-imaging-settings-arrow-135x150.png 135w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/2-imaging-settings-arrow-271x300.png 271w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/2-imaging-settings-arrow-768x850.png 768w\" sizes=\"(max-width: 886px) 100vw, 886px\" \/><p id=\"caption-attachment-2030\" class=\"wp-caption-text\">Atola Insight Forensic: Segmented hashing option<\/p><\/div>\n<p lang=\"en-US\">Please note that Segmented hashing option disables imaging in reverse direction on all passes.<\/p>\n<p lang=\"en-US\">Just as imaging narrows down the problematic areas and reads the data within these areas on <a href=\"https:\/\/atola.com\/products\/insight\/manual\/segmented-hashing.html\">each subsequent pass<\/a>, Segmented hash is calculated for the successfully read spans of data.<\/p>\n<div id=\"attachment_2026\" style=\"width: 760px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-2026\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-2026 size-large\" src=\"https:\/\/blog.atola.com\/wp-content\/uploads\/2017\/11\/3-imaging-4-pass-1024x643.png\" alt=\"\" width=\"750\" height=\"471\" srcset=\"https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/3-imaging-4-pass-1024x643.png 1024w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/3-imaging-4-pass-150x94.png 150w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/3-imaging-4-pass-300x188.png 300w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/3-imaging-4-pass-768x482.png 768w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/3-imaging-4-pass.png 1307w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><p id=\"caption-attachment-2026\" class=\"wp-caption-text\">Atola Insight Forensic: Damaged drive imaging<\/p><\/div>\n<p lang=\"en-US\">Once imaging is completed, you can find the set of hashes calculated in the course of imaging. Go to the imaging report<\/p>\n<div id=\"attachment_2031\" style=\"width: 760px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-2031\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-2031 size-large\" src=\"https:\/\/blog.atola.com\/wp-content\/uploads\/2017\/11\/4-imaging-results-arrow-1024x643.png\" alt=\"\" width=\"750\" height=\"471\" srcset=\"https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/4-imaging-results-arrow-1024x643.png 1024w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/4-imaging-results-arrow-150x94.png 150w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/4-imaging-results-arrow-300x188.png 300w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/4-imaging-results-arrow-768x482.png 768w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/4-imaging-results-arrow.png 1307w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><p id=\"caption-attachment-2031\" class=\"wp-caption-text\">Atola Insight Forensic: Imaging results<\/p><\/div>\n<p lang=\"en-US\">In the excel file with segmented hashes you can find the hash calculated for all the 4 GB segments of the drive space, as configured in the settings. Some of the segments are smaller due to an encountered bad sector, which, in accordance with the multi-pass imaging algorithm forced Insight to jump by a preconfigured number of sectors. Lower in the table you can find hash calculated for smaller segments within the jump area within the first three passes illustrating the concept:<\/p>\n<div id=\"attachment_2028\" style=\"width: 760px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-2028\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-2028 size-large\" src=\"https:\/\/blog.atola.com\/wp-content\/uploads\/2017\/11\/5-segmented-hashes-3passes-1024x445.png\" alt=\"\" width=\"750\" height=\"326\" srcset=\"https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/5-segmented-hashes-3passes-1024x445.png 1024w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/5-segmented-hashes-3passes-150x65.png 150w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/5-segmented-hashes-3passes-300x130.png 300w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/5-segmented-hashes-3passes-768x334.png 768w, https:\/\/atola.com\/blog\/wp-content\/uploads\/2017\/11\/5-segmented-hashes-3passes.png 1346w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><p id=\"caption-attachment-2028\" class=\"wp-caption-text\">Hash calculated for smaller segments within the jump area<\/p><\/div>\n<p lang=\"en-US\">This way segmented hashing allows obtaining a hash\u00a0even for a severely damaged drive.<\/p>\n<p lang=\"en-US\">Please follow this link to learn how you can easily verify segmented hashes:<br \/>\n<a href=\"https:\/\/atola.com\/products\/insight\/manual\/verify-image-with-segmented-hashing.html\">https:\/\/atola.com\/products\/insight\/manual\/verify-image-with-segmented-hashing.html<\/a><\/p>\n<p lang=\"en-US\">__<\/p>\n<p lang=\"en-US\">In November 2016 Atola Technology introduced a new hashing method called Segmented hashing.<\/p>\n<p lang=\"en-US\">Atola&#8217;s open-source tool Seghash, which was written in Go and has been released under MIT license, works on Windows, Linux and macOS. Atola Technology has published the tool on its <a href=\"https:\/\/github.com\/atola-technology\/seghash\">Github<\/a>\u00a0page and encouraged the adoption of the segmented hashing algorithm by software vendors who want to provide their users with a superior hashing option.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When you work with a damaged device, and imaging can only be performed in multiple passes due to bad sectors or physically damaged areas or heads, it is impossible to calculate linear hash of the drive. This can become a serious challenge if you need to prove evidence integrity in [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Atola Insight Forensic: Calculating segmented hash of a damaged drive<\/title>\n<meta name=\"description\" content=\"When you work with a damaged device, and imaging can only be performed in multiple passes due to bad sectors or physically damaged areas or heads, it is impossible to calculate linear hash of the drive. This can become a serious challenge if you need to prove evidence integrity in the court of law. And it is for such cases that Atola Insight Forensic has Segmented hashing functionality.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Atola Insight Forensic: Calculating segmented hash of a damaged drive\" \/>\n<meta property=\"og:description\" content=\"When you work with a damaged device, and imaging can only be performed in multiple passes due to bad sectors or physically damaged areas or heads, it is impossible to calculate linear hash of the drive. This can become a serious challenge if you need to prove evidence integrity in the court of law. And it is for such cases that Atola Insight Forensic has Segmented hashing functionality.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/AtolaTechnology\" \/>\n<meta property=\"article:published_time\" content=\"2017-11-22T16:04:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-06T05:31:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.atola.com\/wp-content\/uploads\/2017\/11\/1-diagnostics-results-arrow-996x1024.png\" \/>\n<meta name=\"author\" content=\"Yulia Samoteykina\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@atola_insight\" \/>\n<meta name=\"twitter:site\" content=\"@atola_insight\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Yulia Samoteykina\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/\"},\"author\":{\"name\":\"Yulia Samoteykina\",\"@id\":\"https:\/\/atola.com\/blog\/#\/schema\/person\/f5faf6ed7d19bbc113d3d54fd30b6820\"},\"headline\":\"Calculating segmented hash of a damaged drive\",\"datePublished\":\"2017-11-22T16:04:47+00:00\",\"dateModified\":\"2026-05-06T05:31:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/\"},\"wordCount\":521,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/atola.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.atola.com\/wp-content\/uploads\/2017\/11\/1-diagnostics-results-arrow-996x1024.png\",\"articleSection\":[\"Atola Insight Forensic\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/\",\"url\":\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/\",\"name\":\"Atola Insight Forensic: Calculating segmented hash of a damaged drive\",\"isPartOf\":{\"@id\":\"https:\/\/atola.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/atola.com\/blog\/calculating-segmented-hash-of-a-damaged-drive\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.atola.com\/wp-content\/uploads\/2017\/11\/1-diagnostics-results-arrow-996x1024.png\",\"datePublished\":\"2017-11-22T16:04:47+00:00\",\"dateModified\":\"2026-05-06T05:31:36+00:00\",\"description\":\"When you work with a damaged device, and imaging can only be performed in multiple passes due to bad sectors or physically damaged areas or heads, it is impossible to calculate linear hash of the drive. 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