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The second achievement date occurred on May 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 6,875 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on July 1, 2023, subject to continued employment. These shares are reflected on Table I, and no units remain subject to these performance-based and time-based vesting conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Performance-Based Restricted Stock Units were previously reported on July 2, 2020, which vest in two equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The second achievement date occurred on May 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 6,875 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on July 1, 2023, subject to continued employment. These shares are reflected on Table I, and no units remain subject to these performance-based and time-based vesting conditions."}],"balance_after":0,"derivative":{"expiration_date":"2025-07-01","underlying":"Common Stock","underlying_shares":6875},"source":{"system":"sec-edgar","filing":"0000709283-21-000018","document":"wf-form4_162142886791967.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/709283/000070928321000018/wf-form4_162142886791967.xml","form_type":"4"}},{"id":2706712,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":80597,"kind":"person","name":"Moorehead Lewis W.","position":1,"cik":"0001597383","reported_name":"Moorehead Lewis W.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Performance-Based Restricted Stock Units","published_at":"2021-05-19T12:54:42.000Z","date":"2021-05-11","kind":"exercise","acquired":false,"shares":16000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Performance-Based Restricted Stock Units were previously reported on September 10, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The third achievement date occurred on May 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 16,000 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on September 5, 2022, subject to continued employment. These shares are reflected on Table I, and no units remain that are subject to these performance-based and time-based vesting conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Performance-Based Restricted Stock Units were previously reported on September 10, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The third achievement date occurred on May 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 16,000 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on September 5, 2022, subject to continued employment. 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However, these shares remain subject to time-based vesting conditions and will therefore vest in equal installments with 1/3rd July 1, 2021, 1/3rd July 1, 2022 and 1/3rd July 1, 2023, subject to continued employment."}],"balance_after":204857,"source":{"system":"sec-edgar","filing":"0000709283-21-000018","document":"wf-form4_162142886791967.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/709283/000070928321000018/wf-form4_162142886791967.xml","form_type":"4"}},{"id":2706710,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":80597,"kind":"person","name":"Moorehead Lewis W.","position":1,"cik":"0001597383","reported_name":"Moorehead Lewis W.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2021-05-19T12:54:42.000Z","date":"2021-05-11","kind":"exercise","acquired":true,"shares":22875,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Performance-Based Restricted Stock Units were previously reported on September 10, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The third achievement date occurred on May 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 16,000 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on September 5, 2022, subject to continued employment. These shares are reflected on Table I, and no units remain that are subject to these performance-based and time-based vesting conditions."},{"field":"security","element":"securityTitle","label":"F2","text":"Performance-Based Restricted Stock Units were previously reported on July 2, 2020, which vest in two equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The second achievement date occurred on May 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 6,875 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on July 1, 2023, subject to continued employment. These shares are reflected on Table I, and no units remain subject to these performance-based and time-based vesting conditions."}],"balance_after":191107,"source":{"system":"sec-edgar","filing":"0000709283-21-000018","document":"wf-form4_162142886791967.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/709283/000070928321000018/wf-form4_162142886791967.xml","form_type":"4"}},{"id":2790527,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":80597,"kind":"person","name":"Moorehead Lewis W.","position":1,"cik":"0001597383","reported_name":"Moorehead Lewis W.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Performance-Based Restricted Stock Units","published_at":"2021-03-15T21:11:32.000Z","date":"2021-03-11","kind":"exercise","acquired":false,"shares":6875,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Performance-Based Restricted Stock Units were previously reported on July 2, 2020, which vest in two equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The first achievement date occurred on March 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 6,875 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on January 1, 2022, subject to continued employment. These shares are reflected on Table I, and 6,875 units remaining subject to these performance-based and time-based vesting conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Performance-Based Restricted Stock Units were previously reported on July 2, 2020, which vest in two equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The first achievement date occurred on March 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 6,875 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on January 1, 2022, subject to continued employment. These shares are reflected on Table I, and 6,875 units remaining subject to these performance-based and time-based vesting conditions."}],"balance_after":6875,"derivative":{"expiration_date":"2025-07-01","underlying":"Common Stock","underlying_shares":6875},"source":{"system":"sec-edgar","filing":"0000709283-21-000008","document":"wf-form4_161584267238458.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/709283/000070928321000008/wf-form4_161584267238458.xml","form_type":"4"}},{"id":2790526,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":80597,"kind":"person","name":"Moorehead Lewis W.","position":1,"cik":"0001597383","reported_name":"Moorehead Lewis W.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Performance-Based Restricted Stock Units","published_at":"2021-03-15T21:11:32.000Z","date":"2021-03-11","kind":"exercise","acquired":false,"shares":16000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Performance-Based Restricted Stock Units were previously reported on September 10, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The second achievement date occurred on March 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 16,000 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on September 5, 2021, subject to continued employment. These shares are reflected on Table I, and 16,000 units remaining subject to these performance-based and time-based vesting conditions"},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Performance-Based Restricted Stock Units were previously reported on September 10, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The second achievement date occurred on March 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 16,000 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on September 5, 2021, subject to continued employment. These shares are reflected on Table I, and 16,000 units remaining subject to these performance-based and time-based vesting conditions"}],"balance_after":16000,"derivative":{"expiration_date":"2029-09-06","underlying":"Common Stock","underlying_shares":16000},"source":{"system":"sec-edgar","filing":"0000709283-21-000008","document":"wf-form4_161584267238458.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/709283/000070928321000008/wf-form4_161584267238458.xml","form_type":"4"}},{"id":2790525,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":80597,"kind":"person","name":"Moorehead Lewis W.","position":1,"cik":"0001597383","reported_name":"Moorehead Lewis W.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2021-03-15T21:11:32.000Z","date":"2021-03-11","kind":"exercise","acquired":true,"shares":22875,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Performance-Based Restricted Stock Units were previously reported on September 10, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The second achievement date occurred on March 11, 2021, as certified by the leadership and compensation committee of QMCO, resulting in 16,000 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on September 5, 2021, subject to continued employment. These shares are reflected on Table I, and 16,000 units remaining subject to these performance-based and time-based vesting conditions"},{"field":"security","element":"securityTitle","label":"F2","text":"Performance-Based Restricted Stock Units were previously reported on July 2, 2020, which vest in two equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock during any hundred (100) calendar day period, and upon specified service dates, whichever is later. 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These shares are reflected on Table I, and 6,875 units remaining subject to these performance-based and time-based vesting conditions."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 707 shares acquired under Quantum Corporation's Employee Stock Purchase Plan on February 5, 2021."}],"balance_after":168232,"source":{"system":"sec-edgar","filing":"0000709283-21-000008","document":"wf-form4_161584267238458.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/709283/000070928321000008/wf-form4_161584267238458.xml","form_type":"4"}},{"id":2933875,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":80597,"kind":"person","name":"Moorehead Lewis W.","position":1,"cik":"0001597383","reported_name":"Moorehead Lewis W.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2020-12-24T00:29:10.000Z","date":"2020-12-23","kind":"sale","acquired":false,"shares":13312,"price":6.3657,"value":84740.1984,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of performance stock units granted on September 6, 2019 and restricted stock units granted on November 1, 2018 and September 6, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This is the price of the shares sold, $6.3657 per share. Upon request by the Commission staff, Quantum Corporation, or a security holder of the Quantum Corporation, the Reporting Person will provide full information regarding the number of shares sold at this price as set forth in this Form 4."}],"balance_after":144650,"source":{"system":"sec-edgar","filing":"0000709283-20-000045","document":"wf-form4_160876972350546.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/709283/000070928320000045/wf-form4_160876972350546.xml","form_type":"4"}},{"id":3047075,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":80597,"kind":"person","name":"Moorehead Lewis W.","position":1,"cik":"0001597383","reported_name":"Moorehead Lewis W.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2020-08-26T20:23:21.000Z","date":"2020-08-24","kind":"sale","acquired":false,"shares":4465,"price":5.3823,"value":24031.9695,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of performance stock units granted on November 1, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This is the weighted average price of the shares sold, which ranged from $5.3798 to $5.5240 per share. Upon request by the Commission staff, Quantum Corporation, or a security holder of the Quantum Corporation, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 596 shares acquired under Quantum Corporation's Employee Stock Purchase Plan on August 5, 2020."}],"balance_after":157962,"source":{"system":"sec-edgar","filing":"0000709283-20-000025","document":"wf-form4_159847337387936.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/709283/000070928320000025/wf-form4_159847337387936.xml","form_type":"4"}},{"id":3094083,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":80597,"kind":"person","name":"Moorehead Lewis W.","position":1,"cik":"0001597383","reported_name":"Moorehead Lewis W.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Performance-Based Restricted Stock Units","published_at":"2020-07-02T20:26:29.000Z","date":"2020-07-01","kind":"grant","acquired":false,"shares":13750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Grant of Performance-Based Restricted Stock Units (\"PSUs\"), each of which represents a contingent right to receive one share of common stock of QMCO, with vesting subject to the achievement of specified levels of the average closing prices of a share of QMCO common stock during any one hundred (100) calendar day period occurring between July 1, 2020 and July 1, 2025. Vesting is subject to continued employment with QMCO through the later of the achievement date or service vesting date, which occurs in two equal installments on January 1, 2022 and July 1, 2023."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Grant of Performance-Based Restricted Stock Units (\"PSUs\"), each of which represents a contingent right to receive one share of common stock of QMCO, with vesting subject to the achievement of specified levels of the average closing prices of a share of QMCO common stock during any one hundred (100) calendar day period occurring between July 1, 2020 and July 1, 2025. 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Vesting is subject to continued employment with QMCO through the service vesting date, which occurs in three equal annual installments on July 1, 2021, July 1, 2022 and July 1, 2023."}],"balance_after":161831,"source":{"system":"sec-edgar","filing":"0000709283-20-000014","document":"wf-form4_159372154070823.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/709283/000070928320000014/wf-form4_159372154070823.xml","form_type":"4"}},{"id":3201367,"issuer":{"id":4987,"kind":"organization","name":"QUANTUM CORP /DE/","symbol":"QMCO"},"owners":[{"id":80597,"kind":"person","name":"Moorehead Lewis W.","position":1,"cik":"0001597383","reported_name":"Moorehead Lewis W.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Performance-Based Restricted Stock Units","published_at":"2020-03-19T20:37:31.000Z","date":"2020-03-17","kind":"exercise","acquired":false,"shares":16000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Performance-Based Restricted Stock Units were previously reported on September 10, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock  during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The first achievement date occurred on March 17, 2020, as certified by the leadership and compensation committee of QMCO, resulting in 16,000 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on September 5, 2020, subject to continued employment. These shares are reflected on Table I, and 32,000 units remaining subject to these performance-based and time-based vesting conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Performance-Based Restricted Stock Units were previously reported on September 10, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock  during any hundred (100) calendar day period, and upon specified service dates, whichever is later. The first achievement date occurred on March 17, 2020, as certified by the leadership and compensation committee of QMCO, resulting in 16,000 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on September 5, 2020, subject to continued employment. 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The third achievement date occurred on March 17, 2020, as certified by the leadership and compensation committee of QMCO, resulting in 16,666 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest on May 31, 2021, subject to continued employment. These shares are reflected on Table I, and no units remain subject to these performance-based and time-based vesting conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Performance-Based Restricted Stock Units were previously reported on October 2, 2019, which vest in three equal components upon the later of achievement of specified levels of the average closing prices of a share of QMCO common stock  during any sixty (60) day trading period between June 1, 2018 and May 31, 2022, and upon specified service dates, whichever is later. 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