{"id":920,"date":"2024-11-22T16:06:10","date_gmt":"2024-11-22T16:06:10","guid":{"rendered":"https:\/\/elusivedata.io\/?p=920"},"modified":"2025-07-18T18:04:37","modified_gmt":"2025-07-18T18:04:37","slug":"2-2","status":"publish","type":"post","link":"https:\/\/elusivedata.io\/nl\/2-2\/","title":{"rendered":"GPT deel 2. De rol van de GPT-header in schijfintegriteit."},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-introduction\">Inleiding<\/h2>\n\n\n\n<p>In het eerste deel van deze blogreeks onderzochten we de Protective MBR en zijn rol in het waarborgen van de compatibiliteit van moderne GPT-gepartitioneerde schijven met oudere systemen. We hebben onderzocht hoe de Protective MBR dient als barri\u00e8re om te voorkomen dat oudere systemen GPT-schijven verkeerd interpreteren, waardoor de hele schijf wordt gemarkeerd als in gebruik door GPT. Deze basiskennis vormt de basis voor een diepere duik in het hart van de GUID Partition Table (GPT) zelf - de GPT Header.<\/p>\n\n\n\n<p>In dit tweede deel zullen we de GPT Header uitpakken, een cruciaal onderdeel van het GPT schema dat vitale informatie geeft over de structuur van de schijf. We zullen elk veld binnen de GPT Header onderzoeken, de betekenis ervan uitleggen en hoe het bijdraagt aan de algemene functionaliteit en integriteit van de schijf. Aan het einde van deze post heb je een uitgebreid begrip van de GPT Header, zodat je met vertrouwen GPT-gepartitioneerde schijven kunt analyseren en manipuleren in forensische onderzoeken of gegevensherstelscenario's.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-gpt-header-overview\">Overzicht GPT-headers<\/h2>\n\n\n\n<p>De GPT (GUID Partition Table) Header is een cruciaal onderdeel van het partitioneringssysteem van de schijf. Het verdeelt de schijf in afzonderlijke secties, die elk verschillende soorten gegevens kunnen opslaan, zoals je besturingssysteem, persoonlijke bestanden, toepassingsgegevens of games. Deze secties kunnen verschillende schijven zijn (zoals de C: schijf, D: schijf, E: schijf, etc.).<\/p>\n\n\n\n<p>De GPT Header bevat een reservekopie aan het einde van de schijf, vergelijkbaar met het hebben van een reservesleutel voor de bibliotheekcatalogus voor het geval de hoofdsleutel verloren gaat of beschadigd raakt. Dit zorgt ervoor dat we onze gegevens kunnen vinden en openen, zelfs als er iets mis gaat.<\/p>\n\n\n\n<p>De GPT-header geeft de locatie van zijn back-up en de locatie van de GUID Partition Table Entry Array, een lijst van GPT-partitie-ingangen die aangeven waar die secties (partities) zich op de schijf bevinden.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"742\" height=\"164\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Figure-1.png\" alt=\"\" class=\"wp-image-934\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Figure-1.png 742w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Figure-1-600x133.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Figure-1-300x66.png 300w\" sizes=\"(max-width: 742px) 100vw, 742px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><em>Figuur 1: Lay-out van een hypothetische Windows 10-installatie met \u00e9\u00e9n volume (n = laatste sector van de schijf)<\/em><\/p>\n\n\n\n<p>De GPT Header begint met zijn handtekening, EFI PART. De rest van de waarden worden uitgesplitst in de onderstaande tabel:<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-gpt-header-structure\">GPT-kopstructuur<\/h2>\n\n\n\n<p>De GPT Header begint met de handtekening 'EFI PART'. De rest van de waarden worden in de onderstaande tabel uitgesplitst:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"746\" height=\"666\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD1.png\" alt=\"\" class=\"wp-image-936\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD1.png 746w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD1-600x536.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD1-300x268.png 300w\" sizes=\"(max-width: 746px) 100vw, 746px\" \/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code><\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"796\" height=\"179\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Table1.png\" alt=\"\" class=\"wp-image-937\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Table1.png 796w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Table1-600x135.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Table1-300x67.png 300w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Table1-768x173.png 768w\" sizes=\"(max-width: 796px) 100vw, 796px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\">Bron: <a href=\"https:\/\/uefi.org\/specs\/UEFI\/2.10\/05_GUID_Partition_Table_Format.html\">https:\/\/uefi.org\/specs\/UEFI\/2.10\/05_GUID_Partition_Table_Format.html<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"743\" height=\"772\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_1-right-background.png\" alt=\"\" class=\"wp-image-939\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_1-right-background.png 743w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_1-right-background-600x623.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_1-right-background-289x300.png 289w\" sizes=\"(max-width: 743px) 100vw, 743px\" \/><\/figure>\n\n\n\n<p>Tot nu toe blijven de eerste 16 bytes van de GPT-header constant voor verschillende GPT-schijven.<\/p>\n\n\n\n<p>GPT-kop CRC<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"741\" height=\"400\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_2-right-background.png\" alt=\"\" class=\"wp-image-941\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_2-right-background.png 741w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_2-right-background-600x324.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_2-right-background-300x162.png 300w\" sizes=\"(max-width: 741px) 100vw, 741px\" \/><\/figure>\n\n\n\n<p>Hieronder staat een voorbeeld van hoe je de CRC32 voor de GPT-header berekent:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"765\" height=\"306\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Comparison-Table.png\" alt=\"\" class=\"wp-image-942\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Comparison-Table.png 765w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Comparison-Table-600x240.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Comparison-Table-300x120.png 300w\" sizes=\"(max-width: 765px) 100vw, 765px\" \/><\/figure>\n\n\n\n<p>Je kunt een Python script gebruiken om de ge\u00efsoleerde bytes CRC te berekenen:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"674\" height=\"468\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python1.png\" alt=\"\" class=\"wp-image-943\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python1.png 674w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python1-600x417.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python1-300x208.png 300w\" sizes=\"(max-width: 674px) 100vw, 674px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\">Het Python-script is te vinden op: <a href=\"https:\/\/github.com\/eichbaumj\/Python\">https:\/\/github.com\/eichbaumj\/Python<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"540\" height=\"246\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python2.png\" alt=\"\" class=\"wp-image-944\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python2.png 540w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python2-300x137.png 300w\" sizes=\"(max-width: 540px) 100vw, 540px\" \/><\/figure>\n\n\n\n<p>Het Python script neemt de resulterende CRC32 waarde en converteert deze naar het formaat dat nodig is voor de GPT Header. De berekende waarde is in dit geval 0x1B2C37BC. Maar om het op te slaan in het veld binnen de GPT-header, wordt de waarde little endian gelezen: 0xBC372C1B.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"745\" height=\"696\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_3-right-background.png\" alt=\"\" class=\"wp-image-946\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_3-right-background.png 745w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_3-right-background-600x561.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_3-right-background-300x280.png 300w\" sizes=\"(max-width: 745px) 100vw, 745px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-disk-guid\">GUID schijf<\/h3>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"745\" height=\"244\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_4-Under-Disk-GUID-header-right-background.png\" alt=\"\" class=\"wp-image-947\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_4-Under-Disk-GUID-header-right-background.png 745w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_4-Under-Disk-GUID-header-right-background-600x197.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_4-Under-Disk-GUID-header-right-background-300x98.png 300w\" sizes=\"(max-width: 745px) 100vw, 745px\" \/><\/figure>\n\n\n\n<p>De schermafbeelding hieronder toont de GUID gemarkeerd in de GPT Header:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"811\" height=\"474\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD2.png\" alt=\"\" class=\"wp-image-949\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD2.png 811w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD2-600x351.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD2-300x175.png 300w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD2-768x449.png 768w\" sizes=\"(max-width: 811px) 100vw, 811px\" \/><\/figure>\n\n\n\n<p>De GUID is een hexadecimale waarde van 16 bytes, maar als je denkt dat je de waarden gewoon kunt kopi\u00ebren en ze op de juiste manier kunt scheiden met koppeltekens en er accolades omheen kunt zetten, dan heb je het mis. Je zou eindigen met de verkeerde waarde.<\/p>\n\n\n\n<p>Je kunt zien dat HxD de GUID-conversie uitvoert in de Data Inspector rechts. Maar hoe gebeurt dat? Hoe:<br>55 BA 55 51 2B D8 59 41 BC 1F C4 17 80 0F D7 63<\/p>\n\n\n\n<p>Worden:<\/p>\n\n\n\n<p>{5155BA55-D82B-4159-BC1F-C417800FD763}<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-the-guid-format\"><em>De GUID-indeling<\/em><\/h4>\n\n\n\n<p>XX XX XX | XX XX XX | XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX<\/p>\n\n\n\n<p>55 BA 55 51 | 2B D8 | 59 41 | BC 1F | C4 17 80 0F D7 63<\/p>\n\n\n\n<p>De eerste set van vier bytes wordt geconverteerd naar little-endian hex: 51 55 BA 55<\/p>\n\n\n\n<p>De tweede set van 2 bytes wordt geconverteerd naar little-endian hex: D8 2B<\/p>\n\n\n\n<p>De derde set van 2 bytes wordt geconverteerd naar little-endian hex: 59 41<\/p>\n\n\n\n<p>De overige twee sets hexwaarden blijven zoals ze zijn, big-endian: BC 1F | C4 17 80 0F D7 63<\/p>\n\n\n\n<p>Als alle conversies klaar zijn, kunnen we ze allemaal samenvoegen, koppeltekens plaatsen waar ze moeten staan en het geheel omsluiten met accolades:<\/p>\n\n\n\n<p>{5155BA55-D82B-4159-BC1F-C417800FD763}<\/p>\n\n\n\n<p>We kunnen bevestigen dat dit de juiste codering van de GUID is door diskpart te starten vanaf de commandoregel en te controleren op de uniqueid van de schijf:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"549\" height=\"501\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Terminal1.png\" alt=\"\" class=\"wp-image-950\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Terminal1.png 549w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Terminal1-300x274.png 300w\" sizes=\"(max-width: 549px) 100vw, 549px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"745\" height=\"398\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_5-right-background.png\" alt=\"\" class=\"wp-image-951\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_5-right-background.png 745w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_5-right-background-600x321.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_series_5-right-background-300x160.png 300w\" sizes=\"(max-width: 745px) 100vw, 745px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-gpt-partition-table-checksum-crc\">GPT Partitietabel Controlesom CRC<\/h3>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"743\" height=\"223\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_6-right-background.png\" alt=\"\" class=\"wp-image-952\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_6-right-background.png 743w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_6-right-background-600x180.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Image_Series_6-right-background-300x90.png 300w\" sizes=\"(max-width: 743px) 100vw, 743px\" \/><\/figure>\n\n\n\n<p>We kunnen hetzelfde Python-script gebruiken, maar de hexadecimale waarden vervangen door de waarden in de Partition Entry Array.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"565\" height=\"453\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python3.png\" alt=\"\" class=\"wp-image-953\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python3.png 565w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python3-300x241.png 300w\" sizes=\"(max-width: 565px) 100vw, 565px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"564\" height=\"211\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python4.png\" alt=\"\" class=\"wp-image-954\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python4.png 564w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python4-300x112.png 300w\" sizes=\"(max-width: 564px) 100vw, 564px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"568\" height=\"242\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD3.png\" alt=\"\" class=\"wp-image-956\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD3.png 568w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD3-300x128.png 300w\" sizes=\"(max-width: 568px) 100vw, 568px\" \/><\/figure>\n\n\n\n<p>En we kunnen zien dat de waarde overeenkomt met wat er in de GPT-header staat.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-repairing-a-gpt-header\">Een GPT-header repareren<\/h2>\n\n\n\n<p>Ok\u00e9, nu we weten hoe de GPT-header is opgebouwd en dat er een back-up is in de laatste sector van de schijf, hoe repareren we de GPT-header als deze corrupt raakt of wordt gewist?<\/p>\n\n\n\n<p>Om de GPT-header te repareren, kopieert u de laatste 512 bytes van het einde van de schijf en plakt u ze in LBA 1 (sector #2). Merk op dat een paar aanpassingen nodig zijn.<\/p>\n\n\n\n<p>Hieronder staat een voorbeeld van hoe de back-up GPT-header eruit ziet aan het einde van een schijf:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"793\" height=\"625\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD4.png\" alt=\"\" class=\"wp-image-957\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD4.png 793w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD4-600x473.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD4-300x236.png 300w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD4-768x605.png 768w\" sizes=\"(max-width: 793px) 100vw, 793px\" \/><\/figure>\n\n\n\n<p>We kunnen zien dat sommige waarden constant blijven ten opzichte van de originele GPT-header. Deze constanten zijn hieronder rood gemarkeerd:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"747\" height=\"589\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD5.png\" alt=\"\" class=\"wp-image-958\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD5.png 747w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD5-600x473.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD5-300x237.png 300w\" sizes=\"(max-width: 747px) 100vw, 747px\" \/><\/figure>\n\n\n\n<p>Er zijn vier waarden die moeten worden gewijzigd.<\/p>\n\n\n\n<p>De eerste is de GPT Header CRC, waar we nog op terug zullen komen. Voor nu kunnen deze waarden op nul gezet worden, omdat we de CRC moeten gebruiken die berekend is nadat we de andere waarden hebben aangepast om weer de juiste te krijgen.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"565\" height=\"224\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD6.png\" alt=\"\" class=\"wp-image-961\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD6.png 565w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD6-300x119.png 300w\" sizes=\"(max-width: 565px) 100vw, 565px\" \/><\/figure>\n\n\n\n<p>De volgende is de MyLBA-waarde op offset 24 voor 4 bytes. Deze waarde wijst naar de locatie van de GPT-header (waar deze zich momenteel bevindt) en de huidige positie is LBA 1 of 0x01000000000000000.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"580\" height=\"231\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD7.png\" alt=\"\" class=\"wp-image-962\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD7.png 580w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD7-300x119.png 300w\" sizes=\"(max-width: 580px) 100vw, 580px\" \/><\/figure>\n\n\n\n<p>De 8-byte waarde op offset 32 is de waarde die ons wijst naar de locatie van de back-up GPT Header. De back-up wijst momenteel naar het origineel, maar we moeten deze waarde wijzigen om de laatste sector van de schijf weer te geven. Dit is gebeurd met de hex waarden die we zojuist in de vorige stap hebben veranderd. In dit voorbeeld moet de waarde worden gewijzigd in 0xAFD23B7700000000.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"586\" height=\"238\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD8-2.png\" alt=\"\" class=\"wp-image-964\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD8-2.png 586w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD8-2-300x122.png 300w\" sizes=\"(max-width: 586px) 100vw, 586px\" \/><\/figure>\n\n\n\n<p>De 8-byte waarde op offset 72 moet de locatie en het begin van de GPT Partition Entry Array weergeven. Momenteel wijst de back-up GPT-header naar de back-up van die array. De eigenlijke GPT Partition Array moet op LBA 2 staan. Deze waarde moet worden gewijzigd in 0x020000000000.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"238\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD9-1.png\" alt=\"\" class=\"wp-image-965\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD9-1.png 605w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD9-1-600x236.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD9-1-300x118.png 300w\" sizes=\"(max-width: 605px) 100vw, 605px\" \/><\/figure>\n\n\n\n<p>Met deze drie waarden veranderd, is het tijd om de CRC32 waarde te berekenen.&nbsp;<\/p>\n\n\n\n<p>De resulterende controlesom is:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"624\" height=\"184\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python5-1.png\" alt=\"\" class=\"wp-image-967\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python5-1.png 624w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python5-1-600x177.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-Python5-1-300x88.png 300w\" sizes=\"(max-width: 624px) 100vw, 624px\" \/><\/figure>\n\n\n\n<p>Dus nu kunnen we de 0x00000000 waarden op offset 16 vervangen door 0xBC372C1B:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"636\" height=\"431\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD10.png\" alt=\"\" class=\"wp-image-969\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD10.png 636w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD10-600x407.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HxD10-300x203.png 300w\" sizes=\"(max-width: 636px) 100vw, 636px\" \/><\/figure>\n\n\n\n<p>HxD heeft een CRC32 checksum calculator ingebouwd onder Analyse -&gt; Checksums. De resulterende waarde hoeft alleen maar te worden toegevoegd als een little-endian waarde.<\/p>\n\n\n\n<p>Als we uit nieuwsgierigheid die 512 bytes isoleren voor het origineel en de back-up die we hebben teruggezet, komen de hashwaarden inderdaad overeen, wat aangeeft dat we de originele GPT-header met succes hebben gereproduceerd met behulp van de back-up.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"672\" height=\"184\" src=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HashCalc.png\" alt=\"\" class=\"wp-image-970\" srcset=\"https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HashCalc.png 672w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HashCalc-600x164.png 600w, https:\/\/elusivedata.io\/wp-content\/uploads\/2024\/11\/Blog2-HashCalc-300x82.png 300w\" sizes=\"(max-width: 672px) 100vw, 672px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\">Conclusie<\/h2>\n\n\n\n<p>Het begrijpen van de fijne kneepjes van de GPT Header is essentieel voor iedereen die betrokken is bij digitaal forensisch onderzoek, gegevensherstel of systeembeheer. De GPT Header definieert niet alleen de lay-out en structuur van de schijf, maar zorgt ook voor gegevensintegriteit door mechanismen zoals CRC32-controlesommen en back-upheaders. Door de details van de GPT-header te beheersen, ben je beter uitgerust om problemen met schijven op te lossen en te repareren, waardoor de betrouwbaarheid en toegankelijkheid van kritieke gegevens wordt gegarandeerd.<\/p>\n\n\n\n<p>Als we doorgaan met deze serie, zullen we ons richten op de GPT Partition Table Entry Array. We zullen onderzoeken hoe partitie entries zijn gestructureerd en hoe ze samenwerken met de GPT Header om de organisatie en integriteit van schijfpartities te behouden. Blijf op de hoogte voor een uitgebreide gids over het analyseren en repareren van de GPT Partition Table Entry Array, zodat je over de kennis beschikt om zelfverzekerd om te gaan met GPT-gepartitioneerde schijven.<\/p>\n\n\n\n<p><strong>Deel 1 gemist?<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/elusivedata.io\/nl\/1-2\/\">Begin bij het begin: De beschermende MBR in GPT-gepartitioneerde schijven begrijpen (deel 1)<\/a> - waarin we beschrijven hoe GPT achterwaartse compatibiliteit met oudere systemen garandeert.<\/p>\n\n\n\n<p><strong>Klaar voor de volgende stap?<\/strong><\/p>\n\n\n\n<p>Doorgaan naar <a href=\"https:\/\/elusivedata.io\/nl\/3-2\/\">Deel 3: Navigeren door de GPT Partition Entry Array<\/a> - waarin we onderzoeken hoe partitie-ingangen zijn gestructureerd en hoe ze de GPT-header aanvullen.<\/p>","protected":false},"excerpt":{"rendered":"<p>Ontdek de vitale rol van de GPT-header in het behoud van schijfintegriteit. Dit artikel geeft inzicht in de structuur, het doel en de relevantie voor forensisch onderzoek.<\/p>","protected":false},"author":1,"featured_media":579,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[19],"tags":[],"class_list":["post-920","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-digital-forensics"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>GPT part 2. The Role of the GPT Header in Disk Integrity. - Elusive Data<\/title>\n<meta name=\"description\" content=\"Explore the role of the GPT Header in maintaining disk integrity and enabling forensic analysis. 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